diff --git a/README.md b/README.md
index f77eaf5..514737d 100644
--- a/README.md
+++ b/README.md
@@ -67,8 +67,15 @@ Outside production, the default directory is `data/uploads`; `UPLOAD_DIR` overri
 it. Startup creates the directory and checks write permission, failing clearly rather
 than falling back to another location. Files use `YYYY/MM/DD/<uuid>.<format>` keys.
 Do not publish this directory as a static directory. Back up **both the SQLite database
-and uploads directory**. JSON workspace exports contain attachment references only;
-imports reconnect existing images owned by the same account, not portable image bytes.
+and uploads directory** for server recovery. The workspace's **Download workspace archive**
+button saves a `.tar.gz` containing `workspace.json` and referenced images; import that
+archive on another installation to restore chats with attachments. The importer also
+accepts older JSON exports, which contain attachment references only and reconnect
+images only when those IDs already belong to the importing account. Archives are
+limited to 250 MB uncompressed, and each image must meet the destination's upload limit.
+
+`CHAT_LIMIT` defaults to 10 active chats per account. Archived chats remain available
+without using an active slot; restoring one requires a free slot.
 
 Authenticated API endpoints:
 
diff --git a/eslint.config.js b/eslint.config.js
index 2690113..9851b1e 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,7 +1,10 @@
+/**
+ * @file Konfiguriert ESLint-Regeln und Browser-Globals für JavaScript-Dateien.
+ */
 import js from "@eslint/js";
 import globals from "globals";
 import { defineConfig } from "eslint/config";
 
 export default defineConfig([
-  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: globals.browser } },
+  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: {...globals.browser, ...globals.node} } },
 ]);
diff --git a/package.json b/package.json
index 0851eaf..9ce6d02 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "scripts": {
     "start": "node server.js",
     "dev": "node --watch server.js",
-    "lint": "node scripts/lint.mjs",
+    "lint": "eslint .",
     "test": "node --test"
   },
   "dependencies": {
diff --git a/public/chat.html b/public/chat.html
index fdf43c5..19ecd0a 100644
--- a/public/chat.html
+++ b/public/chat.html
@@ -11,7 +11,7 @@
         href="https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=Manrope:wght@400;500;600;700;800&display=swap"
         rel="stylesheet">
     <script src="/js/theme-bootstrap.js?v=20260909-account-controls"></script>
-    <link rel="stylesheet" href="/css/style.css?v=20260920-web-search-composer" />
+    <link rel="stylesheet" href="/css/style.css?v=20260930-chat-usability" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" href="/css/pages.css?v=20260909-account-controls">
     <link rel="stylesheet" href="/css/shell.css?v=20260909-account-controls">
@@ -41,6 +41,8 @@
                         </div>
                     </div>
                 </aside>
+                <button id="chatSidebarBackdrop" class="chat-sidebar-backdrop" type="button"
+                    aria-label="Close conversation history" hidden></button>
 
                 <section id="main" class="chat-main chat-main-focus" aria-label="Active conversation">
                     <div class="chat-heading">
@@ -127,6 +129,8 @@
                                                             <p id="modelHelpSummary" class="model-help-summary">Pick a
                                                                 model to see what it is best suited for.</p>
                                                         </div>
+                                                        <details class="generation-advanced">
+                                                            <summary>Advanced generation settings</summary>
                                                         <div class="generation-settings-grid">
                                                             <label class="field"><span>Temperature</span><input
                                                                     id="chatTemperature" type="number" min="0" max="2"
@@ -144,6 +148,7 @@
                                                             <button id="saveGenerationSettings" type="button">Save
                                                                 generation settings</button>
                                                         </div>
+                                                        </details>
                                                     </div>
                                                 </details>
                                                 <details
@@ -216,12 +221,12 @@
                                                             data-chat-action="personaState">Roleplay state</button>
                                                         <button id="backupWorkspace"
                                                             class="secondary-action chat-drawer-action"
-                                                            type="button">Backup workspace</button>
+                                                            type="button">Download workspace archive</button>
                                                         <button id="importWorkspace"
                                                             class="secondary-action chat-drawer-action"
                                                             type="button">Import workspace</button>
                                                         <input id="importWorkspaceFile" class="hidden" type="file"
-                                                            accept="application/json,.json" />
+                                                            accept="application/json,.json,.tar.gz,application/gzip" />
                                                     </div>
                                                 </details>
                                                 <details class="chat-drawer-section chat-drawer-danger">
@@ -259,8 +264,11 @@
                         </div>
                     </div>
 
-                    <div id="messages" class="messages-panel messages-panel-focus" role="log" aria-live="polite"
-                        aria-relevant="additions text"></div>
+                    <div class="messages-wrap">
+                        <div id="messages" class="messages-panel messages-panel-focus" role="log" aria-live="polite"
+                            aria-relevant="additions text"></div>
+                        <button id="jumpToLatest" class="jump-to-latest secondary-action hidden" type="button">Jump to latest</button>
+                    </div>
 
                     <div class="input-shell input-shell-focus">
                         <div class="input-meta">
@@ -308,7 +316,7 @@
     </div>
 
     <div id="personaModal" class="modal-overlay side-panel-overlay hidden">
-        <div class="modal-card persona-modal-card side-panel-card">
+        <div class="modal-card persona-modal-card side-panel-card" role="dialog" aria-modal="true" aria-labelledby="personaFormTitle" tabindex="-1">
             <div class="modal-header">
                 <div class="persona-modal-heading">
                     <p class="eyebrow">Persona editor</p>
@@ -372,7 +380,7 @@
     </div>
 
     <div id="roleplayStarterModal" class="modal-overlay side-panel-overlay hidden">
-        <div class="modal-card roleplay-starter-card side-panel-card">
+        <div class="modal-card roleplay-starter-card side-panel-card" role="dialog" aria-modal="true" aria-labelledby="roleplayStarterTitle" tabindex="-1">
             <div class="modal-header">
                 <div class="persona-modal-heading">
                     <p class="eyebrow">Start roleplay</p>
@@ -441,7 +449,7 @@
     </div>
 
     <div id="onboardingModal" class="modal-overlay hidden">
-        <div class="modal-card onboarding-card">
+        <div class="modal-card onboarding-card" role="dialog" aria-modal="true" aria-labelledby="onboardingTitle" aria-describedby="onboardingSubtitle" tabindex="-1">
             <div class="modal-header">
                 <div class="persona-modal-heading">
                     <p class="eyebrow">Get started</p>
@@ -458,9 +466,11 @@
         </div>
     </div>
 
-    <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js" defer></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/15.0.12/marked.min.js"
+        integrity="sha512-rCQgmUulW6f6QegOvTntKKb5IAoxTpGVCdWqYjkXEpzAns6XUFs8NKVqWe+KQpctp/EoRSFSuykVputqknLYMg=="
+        crossorigin="anonymous" defer></script>
     <script src="https://cdn.jsdelivr.net/npm/dompurify@3.0.6/dist/purify.min.js" defer></script>
-    <script type="module" src="/js/script.js?v=20260923-vision-provenance"></script>
+    <script type="module" src="/js/script.js?v=20260930-chat-usability"></script>
     <script type="module" src="/js/workspaceNavigation.js?v=20260909-account-controls"></script>
 </body>
 
diff --git a/public/css/shell.css b/public/css/shell.css
index 712da4d..76ebe60 100644
--- a/public/css/shell.css
+++ b/public/css/shell.css
@@ -33,6 +33,7 @@ body.site-page { width:100%; max-width:none; margin:0; padding:0; background:var
 .chat-page .chat-card { height:calc(100dvh - var(--shell-header-height)); min-height:0; border:0; border-radius:0; box-shadow:none; }
 .chat-page .chat-layout { grid-template-columns:260px minmax(0,1fr); }
 .chat-page .chat-sidebar { position:static; inset:auto; width:auto; transform:none; box-shadow:none; grid-template-rows:auto minmax(0,1fr); padding:24px 18px; gap:20px; }
+.chat-page .chat-sidebar-backdrop { display:none; }
 .chat-page .sidebar-workspace-card { gap:16px; border:0; padding:0; }
 .chat-page .sidebar-workspace-card h2 { margin:0; font-size:.85rem; letter-spacing:0; font-family:var(--font-body); color:var(--text-soft); }
 .chat-page .chat-main { grid-template-rows:auto minmax(0,1fr) auto; }
@@ -44,6 +45,7 @@ body.site-page { width:100%; max-width:none; margin:0; padding:0; background:var
     .chat-page .chat-layout { grid-template-columns:1fr; }
     .chat-page .chat-sidebar { position:fixed; inset:var(--shell-header-height) auto 0 0; width:min(320px,88vw); z-index:80; transform:translateX(-104%); box-shadow:var(--shadow-lg); }
     .chat-page.sidebar-open .chat-sidebar { transform:translateX(0); }
+    .chat-page .chat-sidebar-backdrop:not([hidden]) { display:block; position:fixed; inset:var(--shell-header-height) 0 0; z-index:79; width:100%; height:auto; padding:0; border:0; border-radius:0; background:rgba(0,0,0,.45); }
     .chat-page .sidebar-toggle { display:inline-flex; width:auto; min-width:0; padding:8px 12px; font-size:.8rem; border-radius:10px; }
     .site-page .settings-layout { grid-template-columns:1fr; }
     .site-page .settings-nav { display:flex; flex-wrap:wrap; }
diff --git a/public/css/style.css b/public/css/style.css
index 5bd75d0..46d9bf2 100644
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -363,7 +363,11 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 }
 .chat-item:hover { background: var(--surface-hover); }
 .chat-item.active { background: var(--brand-soft); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); }
-.chat-item-copy { min-width: 0; display: grid; gap: 2px; }
+.chat-item-copy { min-width: 0; width: 100%; padding: 0; display: grid; gap: 2px; justify-items: start; color: inherit; background: transparent; border: 0; text-align: left; font: inherit; }
+.chat-item-copy:hover:not(:disabled) { background: transparent; }
+.chat-item-copy > span, .chat-item-excerpt { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.chat-item-excerpt { color: var(--text-soft); font-size: .73rem; }
+.chat-item:focus-within { border-color: var(--brand); }
 .chat-item-copy strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .chat-item-meta { color: var(--text-muted); font-size: .75rem; }
 .chat-item-delete { min-height: 30px; padding: 5px 8px; color: var(--text-muted); background: transparent; border: 0; font-size: .72rem; }
@@ -394,11 +398,14 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 .chat-header-actions { display: flex; align-items: center; }
 .overflow-trigger { min-height: 38px; padding: 8px 12px; border-radius: 999px; font-size: .8rem; }
 
+.messages-wrap { min-height: 0; position: relative; }
 .messages-panel {
+    height: 100%;
     min-height: 0;
     padding: 28px max(16px, calc((100% - 940px) / 2));
     display: flex; flex-direction: column; gap: 38px; overflow-y: auto;
 }
+.jump-to-latest { position: absolute; left: 50%; bottom: 14px; z-index: 3; transform: translateX(-50%); box-shadow: var(--shadow-md); white-space: nowrap; }
 .messages-empty {
     width: min(680px, 100%); margin: auto; padding: clamp(24px, 5vw, 44px);
     text-align: center; background: var(--surface-soft); border: 1px solid var(--border); border-radius: var(--radius-lg);
@@ -419,6 +426,14 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 .msg.user .msg-actions { right: 0; left: auto; justify-content: flex-end; }
 .msg:hover .msg-actions, .msg:focus-within .msg-actions { opacity: 1; }
 .msg-action-btn { min-height: 30px; padding: 5px 8px; color: var(--text-soft) !important; background: transparent !important; border: 1px solid var(--border); border-radius: 8px; font-size: .7rem; }
+.msg-action-menu { position: relative; }
+.msg-action-menu > summary { display: flex; align-items: center; cursor: pointer; list-style: none; }
+.msg-action-menu > summary::-webkit-details-marker { display: none; }
+.msg-action-menu-items { position: absolute; bottom: calc(100% + 4px); left: 0; min-width: 130px; padding: 5px; display: grid; gap: 3px; background: var(--surface-raised); border: 1px solid var(--border); border-radius: 9px; box-shadow: var(--shadow-lg); }
+.msg.user .msg-action-menu-items { left: auto; right: 0; }
+.msg-action-menu-items .msg-action-btn { width: 100%; text-align: left; border: 0; }
+.msg-action-menu-items .msg-action-btn:hover, .msg-action-menu-items .msg-action-btn:focus-visible { background: var(--surface-hover) !important; }
+.msg-action-menu[open] { z-index: 5; }
 .msg-variant-index { align-self: center; color: var(--text-muted); font-size: .7rem; }
 .typing { display: flex; gap: 5px; }
 .typing-dot { width: 6px; height: 6px; background: var(--brand); border-radius: 50%; animation: typing 1.2s infinite; }
@@ -467,7 +482,10 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 .message-images img { max-width: min(360px, 100%); max-height: 300px; object-fit: contain; border-radius: 12px; }
 .message-images a { max-width: 100%; }
 .image-drag-target { outline: 2px solid currentColor; }
-@media (max-width: 480px) { .input-container { grid-template-columns: 36px 36px 36px minmax(0, 1fr) 36px; gap: 3px; } }
+@media (max-width: 480px) {
+    .input-container { grid-template-columns: repeat(3, 36px) minmax(0, 1fr) 44px; grid-template-areas: "message message message message send" "attach search reasoning . ."; gap: 4px; }
+    #attachImage, #webSearch, #reasoning { width: 36px; height: 36px; min-height: 36px; border-radius: 12px; }
+}
 #webSearch, #reasoning { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 17px; }
 #webSearch { grid-area: search; }
 #reasoning { grid-area: reasoning; }
@@ -483,6 +501,8 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 #send.loading::after { content: "■"; font-size: .85rem; }
 .generation-settings-grid { margin-top: 12px; display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
 .generation-settings-grid .field-wide, .generation-settings-grid button { grid-column: 1 / -1; }
+.generation-advanced { margin-top: 6px; border-top: 1px solid var(--border); }
+.generation-advanced summary { padding: 10px 0; color: var(--text-soft); cursor: pointer; font-size: .8rem; }
 
 /* ---------- Chat settings drawer ---------- */
 .chat-drawer {
diff --git a/public/js/api.js b/public/js/api.js
index 33f7d04..a8ec20b 100644
--- a/public/js/api.js
+++ b/public/js/api.js
@@ -1,3 +1,6 @@
+/**
+ * @file Bündelt JSON-Anfragen und verarbeitet Ereignisse gestreamter Chat-Antworten im Browser.
+ */
 export async function request(url, data, method = "POST") {
     try {
         const res = await fetch(url, {
@@ -60,6 +63,7 @@ export async function stream(url, data, handlers = {}, signal = undefined) {
             if (done) break;
             buffer += decoder.decode(value, {stream: true});
             const parts = buffer.split(/\r?\n\r?\n/);
+            // Das letzte SSE-Ereignis kann unvollständig sein und wird mit dem nächsten Netzwerkblock ergänzt.
             buffer = parts.pop() || "";
             for (const part of parts) {
                 const lines = part.split("\n");
@@ -81,6 +85,7 @@ export async function stream(url, data, handlers = {}, signal = undefined) {
             }
             if (terminal) break;
         }
+        // Ohne explizites Abschluss- oder Fehlerereignis gilt die Verbindung als vorzeitig abgebrochen.
         if (!terminal) throw new Error("Response was interrupted. Please try again.");
     } finally {
         await reader.cancel().catch(() => {});
diff --git a/public/js/attachments.js b/public/js/attachments.js
index 3b65b96..3fd88e3 100644
--- a/public/js/attachments.js
+++ b/public/js/attachments.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verwaltet Bildauswahl, Uploads und Vorschauen sowie die Anzeige gespeicherter Anhänge.
+ */
 export function appendAttachments(container, attachments = []) {
     if (!attachments.length) return;
     const gallery = document.createElement("div");
@@ -24,6 +27,7 @@ export function createAttachmentComposer({onChange, onError}) {
     const preview = document.getElementById("uploadPreviews");
     const composer = document.querySelector(".input-container");
     let items = [];
+    const drafts = new Map();
     let busy = false;
     let limits = {maxSizeMb: 10, maxFiles: 5};
     fetch("/uploads/config").then(r => r.ok ? r.json() : limits).then(value => { limits = value; }).catch(() => {});
@@ -70,13 +74,13 @@ export function createAttachmentComposer({onChange, onError}) {
             const result = await response.json();
             if (!response.ok) throw new Error(result.error || "Upload failed");
             item.metadata = result;
-            if (!items.includes(item)) void fetch(`/attachments/${result.id}`, {method: "DELETE"});
+            if (![items, ...drafts.values()].some(draft => draft.includes(item))) void fetch(`/attachments/${result.id}`, {method: "DELETE"});
         } catch (error) {
             if (error.name !== "AbortError") item.error = error.message || "Upload failed";
         }
         item.uploading = false;
         item.controller = null;
-        render();
+        if (items.includes(item)) render();
     };
     const add = files => {
         if (busy) return;
@@ -114,6 +118,25 @@ export function createAttachmentComposer({onChange, onError}) {
             }
             items = [];
             render();
+        },
+        saveDraft(chatId) {
+            if (chatId != null) drafts.set(chatId, items);
+            items = [];
+            render();
+        },
+        restoreDraft(chatId) {
+            items = drafts.get(chatId) || [];
+            drafts.delete(chatId);
+            render();
+        },
+        discardDraft(chatId) {
+            const saved = drafts.get(chatId) || [];
+            drafts.delete(chatId);
+            for (const item of saved) {
+                item.controller?.abort();
+                URL.revokeObjectURL(item.preview);
+                if (item.metadata) void fetch(`/attachments/${item.metadata.id}`, {method: "DELETE"});
+            }
         }
     };
 }
diff --git a/public/js/chatDrawer.js b/public/js/chatDrawer.js
index b6c845e..3dc8987 100644
--- a/public/js/chatDrawer.js
+++ b/public/js/chatDrawer.js
@@ -1,3 +1,6 @@
+/**
+ * @file Steuert das Chat-Seitenpanel einschließlich Tastaturbedienung und Fokusverwaltung.
+ */
 import {chatDrawer, chatDrawerButton, chatDrawerCloseBtn} from "./dom.js?v=20260909-account-controls";
 
 let lastFocusedElement = null;
diff --git a/public/js/constants.js b/public/js/constants.js
index 53e03e1..b94fb9a 100644
--- a/public/js/constants.js
+++ b/public/js/constants.js
@@ -1,3 +1,6 @@
+/**
+ * @file Stellt gemeinsame Theme-Daten, Einstiegsvorschläge und die angefragte Chat-ID bereit.
+ */
 export const requestedChatId = Number(window.location.pathname.match(/^\/app\/chats\/(\d+)$/)?.[1] || new URLSearchParams(window.location.search).get("chat")) || null;
 
 export const onboardingPrompts = {
diff --git a/public/js/dom.js b/public/js/dom.js
index 9669391..6c3b885 100644
--- a/public/js/dom.js
+++ b/public/js/dom.js
@@ -1,3 +1,6 @@
+/**
+ * @file Bündelt Referenzen auf die HTML-Elemente der Chat-Oberfläche.
+ */
 const $ = (id) => document.getElementById(id);
 
 const chatDiv = $("chat");
diff --git a/public/js/market.js b/public/js/market.js
index 41334fd..314412d 100644
--- a/public/js/market.js
+++ b/public/js/market.js
@@ -1,7 +1,11 @@
+/**
+ * @file Steuert die Persona-Marktplatzoberfläche mit Suche, Vorschauen und Persona-Verwaltung.
+ */
 import { get, post, put } from "./api.js?v=20260909-account-controls";
 import { initializeAppearance } from "./themeController.js?v=20260909-account-controls";
 import { clearStatus, setStatus } from "./statusNotice.js?v=20260909-account-controls";
 import { populatePersonaForm, readPersonaForm } from "./personaForm.js?v=20260909-account-controls";
+import { openModal, closeModal, topModal } from "./modalFocus.js";
 
 const $ = (id) => document.getElementById(id);
 const marketPersonaList = $("marketPersonaList");
@@ -28,7 +32,6 @@ const marketPreviewExampleDialogues = $("marketPreviewExampleDialogues");
 const marketPreviewIntro = $("marketPreviewIntro");
 const marketPreviewUserPersonaField = $("marketPreviewUserPersonaField");
 const marketPreviewUserPersonaSelect = $("marketPreviewUserPersonaSelect");
-const marketPreviewScenarioField = $("marketPreviewScenarioField");
 const marketPreviewScenario = $("marketPreviewScenario");
 const marketPreviewStepOne = $("marketPreviewStepOne");
 const marketPreviewStepTwo = $("marketPreviewStepTwo");
@@ -71,7 +74,6 @@ const marketPersonaFields = {
 
 const validMarketSorts = new Set(["best", "newest", "most_favorited", "most_popular", "top_rated", "alphabetical"]);
 let marketPersonasByType = { assistant: [], user: [] };
-let assistantPersonas = [];
 let userPersonas = [];
 let pendingMarketPersona = null;
 let editingPersonaId = null;
@@ -87,7 +89,7 @@ function setMarketStatus(message, state = "") {
 }
 
 function closeMarketPopup(value = null) {
-    marketPopupModal.classList.add("hidden");
+    closeModal(marketPopupModal);
     if (marketPopupResolver) {
         const resolve = marketPopupResolver;
         marketPopupResolver = null;
@@ -112,7 +114,7 @@ function promptMarketPopup({
     marketPopupInput.placeholder = placeholder;
     marketPopupConfirm.textContent = confirmLabel;
     marketPopupField.classList.remove("hidden");
-    marketPopupModal.classList.remove("hidden");
+    openModal(marketPopupModal, marketPopupInput);
     marketPopupInput.focus();
     marketPopupInput.select();
     return new Promise((resolve) => {
@@ -238,7 +240,7 @@ function setCollapsiblePreviewText(element, value, maxLength = 220) {
 }
 
 function closeMarketPreview() {
-    marketPreviewModal.classList.add("hidden");
+    closeModal(marketPreviewModal);
     pendingMarketPersona = null;
     marketPreviewStep = 1;
     marketPreviewUserPersonaSelect.innerHTML = "";
@@ -315,7 +317,7 @@ function openMarketPreview(persona) {
         marketPreviewConfirm.classList.remove("hidden");
     }
     renderMarketPreviewStep();
-    marketPreviewModal.classList.remove("hidden");
+    openModal(marketPreviewModal, isAssistant ? marketPreviewUserPersonaSelect : marketPreviewConfirm);
 }
 
 function openPersonaForm(persona = null) {
@@ -323,12 +325,11 @@ function openPersonaForm(persona = null) {
     marketPersonaFormTitle.textContent = persona ? "Edit AI Character" : "Create AI Character";
     populatePersonaForm(marketPersonaFields, persona || {});
     setPersonaFormNotice("");
-    marketPersonaModal.classList.remove("hidden");
-    marketPersonaName.focus();
+    openModal(marketPersonaModal, marketPersonaName);
 }
 
 function closePersonaForm() {
-    marketPersonaModal.classList.add("hidden");
+    closeModal(marketPersonaModal);
     editingPersonaId = null;
     setPersonaFormNotice("");
 }
@@ -507,7 +508,6 @@ async function reportPersona(marketId) {
 async function loadOwnedPersonas() {
     const res = await get("/personas");
     if (res.error) return false;
-    assistantPersonas = res.assistantPersonas || [];
     userPersonas = res.userPersonas || [];
     activeUserPersonaId = res.activeUserPersonaId || null;
     return true;
@@ -605,9 +605,19 @@ marketPopupInput.addEventListener("keydown", (event) => {
     }
     if (event.key === "Escape") {
         event.preventDefault();
+        event.stopPropagation();
         closeMarketPopup(null);
     }
 });
+document.addEventListener("keydown", event => {
+    if (event.key !== "Escape") return;
+    const modal = topModal();
+    if (!modal) return;
+    event.preventDefault();
+    if (modal === marketPopupModal) closeMarketPopup(null);
+    else if (modal === marketPersonaModal) closePersonaForm();
+    else if (modal === marketPreviewModal) closeMarketPreview();
+});
 marketSearchInput.addEventListener("input", applyMarketFilter);
 if (marketAssistantSort) {
     marketAssistantSort.addEventListener("change", () => setMarketSort("assistant", marketAssistantSort.value));
diff --git a/public/js/modalFocus.js b/public/js/modalFocus.js
new file mode 100644
index 0000000..813a7f0
--- /dev/null
+++ b/public/js/modalFocus.js
@@ -0,0 +1,40 @@
+const focusableSelector = 'a[href], button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])';
+const stack = [];
+
+function focusables(modal) {
+    return [...modal.querySelectorAll(focusableSelector)].filter(element =>
+        element.getClientRects().length && !element.closest('.hidden, [hidden]'));
+}
+
+export function openModal(modal, preferredFocus) {
+    const previous = document.activeElement;
+    modal.classList.remove('hidden');
+    stack.push({modal, previous});
+    (preferredFocus || focusables(modal)[0] || modal.querySelector('[role="dialog"]'))?.focus();
+}
+
+export function closeModal(modal) {
+    const index = stack.findLastIndex(entry => entry.modal === modal);
+    if (index < 0) return;
+    const [{previous}] = stack.splice(index, 1);
+    modal.classList.add('hidden');
+    if (index === stack.length) {
+        const target = stack.length ? focusables(stack.at(-1).modal)[0] : previous;
+        if (target?.isConnected) target.focus();
+    }
+}
+
+export function topModal() { return stack.at(-1)?.modal || null; }
+
+document.addEventListener('keydown', event => {
+    if (event.key !== 'Tab' || !stack.length) return;
+    const modal = topModal();
+    const elements = focusables(modal);
+    if (!elements.length) { event.preventDefault(); modal.querySelector('[role="dialog"]')?.focus(); return; }
+    const first = elements[0], last = elements.at(-1);
+    if (event.shiftKey && (document.activeElement === first || !modal.contains(document.activeElement))) {
+        event.preventDefault(); last.focus();
+    } else if (!event.shiftKey && (document.activeElement === last || !modal.contains(document.activeElement))) {
+        event.preventDefault(); first.focus();
+    }
+}, true);
diff --git a/public/js/modelCapabilities.js b/public/js/modelCapabilities.js
index fc09ba3..c108dce 100644
--- a/public/js/modelCapabilities.js
+++ b/public/js/modelCapabilities.js
@@ -1,3 +1,6 @@
+/**
+ * @file Ermittelt die Modellfamilie und prüft die Unterstützung des Reasoning-Modus.
+ */
 // Conservative allowlist for models supporting the boolean think API.
 // Unknown models remain usable for normal chat.
 const reasoningFamilies = new Set(["qwen3", "deepseek-r1", "deepseek-v3.1"]);
diff --git a/public/js/modelProfiles.js b/public/js/modelProfiles.js
index 360d3e6..48a8bca 100644
--- a/public/js/modelProfiles.js
+++ b/public/js/modelProfiles.js
@@ -1,3 +1,6 @@
+/**
+ * @file Ordnet Modellen Profilinformationen für ihre Darstellung und Auswahl in der Oberfläche zu.
+ */
 export const defaultModelProfile = {
     badge: "General",
     summary: "Best for general questions, drafting, and everyday conversation. Use a specialized model when you need stronger coding, reasoning, or roleplay behavior."
diff --git a/public/js/pages.js b/public/js/pages.js
index 015c57e..34cefd5 100644
--- a/public/js/pages.js
+++ b/public/js/pages.js
@@ -1,3 +1,6 @@
+/**
+ * @file Steuert öffentliche Seiten sowie Anmelde- und Registrierungsformulare mit Rückkehr in den Arbeitsbereich.
+ */
 import { get, post } from "/js/api.js?v=20260909-account-controls";
 
 const params = new URLSearchParams(location.search);
diff --git a/public/js/personaForm.js b/public/js/personaForm.js
index 0e07577..18dfbf1 100644
--- a/public/js/personaForm.js
+++ b/public/js/personaForm.js
@@ -1,3 +1,6 @@
+/**
+ * @file Überträgt Persona-Daten zwischen Formularfeldern und den verwendeten Datenobjekten.
+ */
 const personaFieldNames = ["name", "pronouns", "appearance", "background", "details", "exampleDialogues"];
 
 export function populatePersonaForm(fields, persona = {}) {
diff --git a/public/js/reasoning.js b/public/js/reasoning.js
index c7f4473..b948f08 100644
--- a/public/js/reasoning.js
+++ b/public/js/reasoning.js
@@ -1,3 +1,6 @@
+/**
+ * @file Steuert die Reasoning-Auswahl und die aufklappbare Anzeige gestreamter Gedankengänge.
+ */
 import {supportsReasoning} from "./modelCapabilities.js?v=20260921-reasoning-capability";
 
 export function createReasoningToggle(button) {
@@ -43,6 +46,7 @@ export function updateReasoning(messageElement, thinking, streaming = false) {
     }
     details.querySelector("summary").textContent = streaming ? "Reasoning · Thinking…" : "Reasoning";
     const content = details.querySelector(".msg-reasoning-content");
+    // Nur automatisch nach unten scrollen, wenn die Ansicht bereits nahe am Ende steht.
     const follow = content.scrollHeight - content.scrollTop - content.clientHeight < 40;
     content.textContent = thinking;
     if (streaming && follow) content.scrollTop = content.scrollHeight;
diff --git a/public/js/regeneration.js b/public/js/regeneration.js
index 0cd15c1..75f4f99 100644
--- a/public/js/regeneration.js
+++ b/public/js/regeneration.js
@@ -1,3 +1,6 @@
+/**
+ * @file Ersetzt eine Antwort während der Neugenerierung in ihrer Nachrichtenkarte und stellt sie bei Fehlern wieder her.
+ */
 import {stream} from "./api.js";
 import {updateReasoning, finishReasoning} from "./reasoning.js";
 import {appendSources} from "./webSearch.js";
@@ -46,6 +49,7 @@ export async function regenerateInline({card, scroller, endpoint, payload, rende
             }
         });
     } finally {
+        // Bei Fehler oder Abbruch die ursprünglichen Knoten samt Ereignishandlern wieder einsetzen.
         if (!committed) update(() => card.replaceChildren(...original));
         card.removeAttribute("aria-busy");
     }
diff --git a/public/js/script.js b/public/js/script.js
index 7f9278c..b8bf469 100644
--- a/public/js/script.js
+++ b/public/js/script.js
@@ -1,9 +1,13 @@
+/**
+ * @file Steuert die Chat-Oberfläche mit Gesprächsauswahl, Nachrichteneingabe, Streaming und Persona-Verwaltung.
+ */
 import { del, get, post, put, stream } from "./api.js?v=20260909-account-controls";
 import { regenerateInline } from "./regeneration.js";
 import { appendSources, createWebSearchToggle } from "./webSearch.js";
-import { appendAttachments, createAttachmentComposer } from "./attachments.js?v=20260923-vision-provenance";
+import { appendAttachments, createAttachmentComposer } from "./attachments.js?v=20260930-chat-usability";
 import { createReasoningToggle, finishReasoning, updateReasoning } from "./reasoning.js?v=20260921-reasoning-capability";
 import { closeChatDrawer, openChatDrawer } from "./chatDrawer.js?v=20260909-account-controls";
+import { openModal, closeModal, topModal } from "./modalFocus.js";
 import { onboardingPrompts, requestedChatId } from "./constants.js?v=20260909-account-controls";
 import { getModelProfile } from "./modelProfiles.js?v=20260909-account-controls";
 import { applyTheme as applySharedTheme, applyThemeMode as applySharedThemeMode, readStoredAppearance } from "./themeController.js?v=20260909-account-controls";
@@ -124,6 +128,16 @@ let chatLoadingDepth = 0;
 let chatActivityDepth = 0;
 let messageRetryState = new Map();
 let availableModelsById = new Map();
+let chatSearchResults = null;
+let chatSearchError = "";
+let chatSearchTimer = null;
+let chatSearchRequest = 0;
+let chatOpenRequest = 0;
+const chatDrafts = new Map();
+const jumpToLatest = document.getElementById("jumpToLatest");
+let scrollFrame = null;
+let renderedChatId = null;
+let renderedMessages = new Map();
 
 
 function setNotice(message = "", state = "") {
@@ -190,15 +204,33 @@ function isMobileLayout() {
 }
 
 function closeMobileSidebar() {
-    if (!chatSidebar) return;
+    if (!chatSidebar || !document.body.classList.contains("sidebar-open")) return;
     document.body.classList.remove("sidebar-open");
-    if (chatSidebarToggle) chatSidebarToggle.setAttribute("aria-expanded", "false");
+    if (chatSidebarToggle) {
+        chatSidebarToggle.setAttribute("aria-expanded", "false");
+        chatSidebarToggle.setAttribute("aria-label", "Open conversation history");
+    }
+    chatSidebar.inert = isMobileLayout();
+    chatSidebar.removeAttribute("aria-modal");
+    chatSidebar.removeAttribute("role");
+    const backdrop = document.getElementById("chatSidebarBackdrop");
+    if (backdrop) backdrop.hidden = true;
+    chatSidebarToggle?.focus();
 }
 
 function openMobileSidebar() {
-    if (!chatSidebar) return;
+    if (!chatSidebar || !isMobileLayout()) return;
+    chatSidebar.inert = false;
+    chatSidebar.setAttribute("role", "dialog");
+    chatSidebar.setAttribute("aria-modal", "true");
     document.body.classList.add("sidebar-open");
-    if (chatSidebarToggle) chatSidebarToggle.setAttribute("aria-expanded", "true");
+    if (chatSidebarToggle) {
+        chatSidebarToggle.setAttribute("aria-expanded", "true");
+        chatSidebarToggle.setAttribute("aria-label", "Close conversation history");
+    }
+    const backdrop = document.getElementById("chatSidebarBackdrop");
+    if (backdrop) backdrop.hidden = false;
+    chatSearchInput?.focus();
 }
 
 function hasCompletedOnboarding() {
@@ -212,7 +244,7 @@ function markOnboardingCompleted() {
 
 function closeOnboarding() {
     if (!onboardingModal) return;
-    onboardingModal.classList.add("hidden");
+    closeModal(onboardingModal);
 }
 
 function renderOnboardingStep() {
@@ -231,6 +263,7 @@ function renderOnboardingStep() {
             button.addEventListener("click", () => {
                 onboardingIntent = key;
                 renderOnboardingStep();
+                onboardingChoices.querySelector(".active")?.focus();
             });
             onboardingChoices.appendChild(button);
         });
@@ -268,7 +301,7 @@ function maybeShowOnboarding() {
     onboardingStep = 1;
     onboardingIntent = "ask";
     renderOnboardingStep();
-    onboardingModal.classList.remove("hidden");
+    openModal(onboardingModal, onboardingChoices.querySelector("button"));
 }
 function setMessageContent(el, content) {
     const markdownParser = window.marked;
@@ -280,11 +313,6 @@ function setMessageContent(el, content) {
     }
 }
 function getChatById(id) { return chatSessions.find((chat) => chat.id === id); }
-function summarizeText(value, limit = 96) {
-    const normalized = String(value || "").replace(/\s+/g, " ").trim();
-    if (!normalized) return "";
-    return normalized.length > limit ? `${normalized.slice(0, limit - 3).trimEnd()}...` : normalized;
-}
 function getPersonaName(id, items) {
     return items.find((persona) => persona.id === id)?.name || "";
 }
@@ -387,15 +415,22 @@ function resizeComposerInput() {
 }
 
 function scrollMessagesToBottom() {
-    requestAnimationFrame(() => {
+    if (scrollFrame !== null) cancelAnimationFrame(scrollFrame);
+    scrollFrame = requestAnimationFrame(() => {
+        scrollFrame = null;
         messagesDiv.scrollTop = messagesDiv.scrollHeight;
+        updateJumpToLatest();
     });
 }
 
-function getNewestMessage() {
-    return currentMessages.length ? currentMessages[currentMessages.length - 1] : null;
+function updateJumpToLatest() {
+    const distance = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight;
+    jumpToLatest.classList.toggle("hidden", distance < 180);
 }
 
+messagesDiv.addEventListener("scroll", updateJumpToLatest, {passive: true});
+jumpToLatest.addEventListener("click", scrollMessagesToBottom);
+
 function getMessageIndexById(messageId) {
     return currentMessages.findIndex((message) => message.id === messageId);
 }
@@ -463,18 +498,12 @@ function syncRetryStateFromMessage(message) {
     return state;
 }
 
-function ensureRetryState(message) {
-    if (!message?.id) return null;
-    let state = messageRetryState.get(message.id);
-    if (!state) {
-        state = syncRetryStateFromMessage(message);
-    }
-    return state;
-}
-
 async function openCreatedChat(chat) {
     if (!chat?.id) throw new Error("The server did not return the newly created chat");
-    if (chatSearchInput) chatSearchInput.value = "";
+    if (chatSearchInput) {
+        chatSearchInput.value = "";
+        scheduleChatSearch();
+    }
     const chatsResponse = await get("/chats");
     if (chatsResponse.error) throw new Error(chatsResponse.error);
     chatSessions = chatsResponse.chats || [];
@@ -542,7 +571,7 @@ async function editChatMessage(messageId, fallbackIndex = -1) {
 async function deleteChatMessage(messageId, fallbackIndex = -1) {
     const target = await resolveMessageTarget(messageId, fallbackIndex);
     if (!target) return setNotice("Message is not ready yet. Try again.", "error");
-    const { index, message } = target;
+    const { message } = target;
     const confirmed = await confirmPopup({
         eyebrow: message.role === "user" ? "Your message" : "Assistant message",
         title: "Delete message",
@@ -702,6 +731,44 @@ function addMessage(contentOrMessage, isUser = false, isLoading = false, options
         header.textContent = isMessageUser ? "You" : (activeChat?.assistant_persona_name || "Assistant");
         setMessageContent(body, message.content);
 
+        const copyBtn = document.createElement("button");
+        copyBtn.type = "button";
+        copyBtn.className = "msg-action-btn";
+        copyBtn.textContent = "Copy";
+        copyBtn.setAttribute("aria-label", `Copy ${isMessageUser ? "your" : "assistant"} message`);
+        copyBtn.addEventListener("click", async () => {
+            try {
+                await navigator.clipboard.writeText(message.content || "");
+                setNotice("Message copied.", "success");
+            } catch {
+                setNotice("Unable to copy message.", "error");
+            }
+        });
+        actions.appendChild(copyBtn);
+
+        if (message.deliveryStatus === "failed" && isMessageUser) {
+            const retryFailedBtn = document.createElement("button");
+            retryFailedBtn.type = "button";
+            retryFailedBtn.className = "msg-action-btn";
+            retryFailedBtn.dataset.messageAction = "retry-failed";
+            retryFailedBtn.textContent = "Retry";
+            retryFailedBtn.disabled = isProcessing;
+            retryFailedBtn.addEventListener("click", () => { void sendMessage({ retryMessage: message }); });
+            actions.appendChild(retryFailedBtn);
+        }
+
+        const menu = document.createElement("details");
+        menu.className = "msg-action-menu";
+        const menuTrigger = document.createElement("summary");
+        menuTrigger.className = "msg-action-btn";
+        menuTrigger.textContent = "More";
+        menuTrigger.setAttribute("aria-label", "More message actions");
+        const menuItems = document.createElement("div");
+        menuItems.className = "msg-action-menu-items";
+        menuItems.addEventListener("click", () => { menu.open = false; });
+        menu.append(menuTrigger, menuItems);
+        if (message.id) actions.appendChild(menu);
+
         const editBtn = document.createElement("button");
         editBtn.type = "button";
         editBtn.className = "msg-action-btn";
@@ -710,7 +777,7 @@ function addMessage(contentOrMessage, isUser = false, isLoading = false, options
         editBtn.addEventListener("click", () => {
             void editChatMessage(message.id, options.messageIndex ?? -1);
         });
-        actions.appendChild(editBtn);
+        menuItems.appendChild(editBtn);
 
         const deleteBtn = document.createElement("button");
         deleteBtn.type = "button";
@@ -720,14 +787,14 @@ function addMessage(contentOrMessage, isUser = false, isLoading = false, options
         deleteBtn.addEventListener("click", () => {
             void deleteChatMessage(message.id, options.messageIndex ?? -1);
         });
-        actions.appendChild(deleteBtn);
+        menuItems.appendChild(deleteBtn);
 
         const branchBtn = document.createElement("button");
         branchBtn.type = "button";
         branchBtn.className = "msg-action-btn";
         branchBtn.textContent = "Branch here";
         branchBtn.addEventListener("click", () => { void branchFromMessage(message.id); });
-        actions.appendChild(branchBtn);
+        menuItems.appendChild(branchBtn);
 
         if (message.role === "bot") {
             const retriesUsed = Math.max(0, Number(message.versionCount || 1) - 1);
@@ -781,7 +848,7 @@ function addMessage(contentOrMessage, isUser = false, isLoading = false, options
         if (!isMessageUser) appendSources(msgDiv, message.sources);
         if (message.deliveryStatus === "failed" && message.errorMessage) {
             const error = document.createElement("p");
-            error.className = "status";
+            error.className = "status error";
             error.textContent = message.errorMessage;
             msgDiv.appendChild(error);
         }
@@ -797,21 +864,46 @@ function addMessage(contentOrMessage, isUser = false, isLoading = false, options
 }
 
 function renderMessages() {
-    messagesDiv.innerHTML = "";
+    if (scrollFrame !== null) { cancelAnimationFrame(scrollFrame); scrollFrame = null; }
+    const sameChat = renderedChatId === activeChatId;
+    const wasReadingEarlier = sameChat && messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight >= 100;
+    const previousScrollTop = messagesDiv.scrollTop;
     const chat = getChatById(activeChatId);
     if (!currentMessages.length && (!chat || chat.assistant_persona_id)) {
+        messagesDiv.replaceChildren();
         renderMessageEmptyState();
+        renderedMessages = new Map();
     } else {
-        currentMessages.forEach((msg, index) => addMessage(msg, msg.role === "user", false, {
-            messageIndex: index,
-            isNewest: index === currentMessages.length - 1
-        }));
+        const fragment = document.createDocumentFragment();
+        const nextRendered = new Map();
+        currentMessages.forEach((msg, index) => {
+            const key = msg.id ? String(msg.id) : null;
+            const snapshot = JSON.stringify(msg);
+            const previous = sameChat && key ? renderedMessages.get(key) : null;
+            const card = previous?.snapshot === snapshot && previous.node.isConnected
+                ? previous.node
+                : addMessage(msg, msg.role === "user", false, {
+                    messageIndex: index,
+                    isNewest: index === currentMessages.length - 1,
+                    detached: true
+                });
+            fragment.append(card);
+            if (key) nextRendered.set(key, {snapshot, node: card});
+        });
+        messagesDiv.replaceChildren(fragment);
+        renderedMessages = nextRendered;
     }
+    renderedChatId = activeChatId;
     renderDrawerSummary();
     updateChatActionState();
     updateComposerPlaceholder();
-    if (currentMessages.length) {
+    if (wasReadingEarlier) {
+        messagesDiv.scrollTop = previousScrollTop;
+        updateJumpToLatest();
+    } else if (currentMessages.length) {
         scrollMessagesToBottom();
+    } else {
+        updateJumpToLatest();
     }
 }
 
@@ -1046,19 +1138,22 @@ function maybeShowPersonaNudge() {
 
 function renderChatList() {
     const query = chatSearchInput.value.trim().toLowerCase();
-    const filtered = chatSessions.filter((chat) => !query
+    const source = query ? (chatSearchResults ?? []) : chatSessions;
+    const filtered = source.filter((chat) => !query
         || chat.title.toLowerCase().includes(query)
         || String(chat.matched_content || "").toLowerCase().includes(query));
     chatList.innerHTML = "";
     if (!filtered.length) {
         const empty = document.createElement("p");
         empty.className = "status";
-        empty.textContent = query ? "No chats match this search." : "No chats yet. Start a new one.";
+        empty.textContent = query && chatSearchError ? chatSearchError
+            : query && chatSearchResults === null ? "Searching chats..."
+            : query ? "No chats match this search." : "No chats yet. Start a new one.";
         chatList.appendChild(empty);
         return;
     }
     const folderGroups = filtered
-        .filter((chat) => chat.folder_name && !chat.archived_at)
+        .filter((chat) => chat.folder_name && !chat.is_pinned && !chat.archived_at)
         .reduce((map, chat) => {
             const key = String(chat.folder_name).trim();
             const items = map.get(key) || [];
@@ -1083,13 +1178,13 @@ function renderChatList() {
         list.setAttribute("role", "list");
         section.append(heading, list);
         group.items.forEach((chat) => {
-            const item = document.createElement("div"), content = document.createElement("div"), title = document.createElement("span"), meta = document.createElement("small"), remove = document.createElement("button");
+            const item = document.createElement("div"), content = document.createElement("button"), title = document.createElement("span"), meta = document.createElement("small"), remove = document.createElement("button");
             item.className = `chat-item${chat.id === activeChatId ? " active" : ""}`;
-            item.setAttribute("role", "button");
-            item.tabIndex = 0;
-            item.setAttribute("aria-label", `Open chat ${chat.title}`);
-            if (chat.id === activeChatId) item.setAttribute("aria-current", "page");
-            content.className = "chat-item-copy";
+            item.setAttribute("role", "listitem");
+            content.type = "button";
+            content.className = "chat-item-copy secondary-action";
+            content.setAttribute("aria-label", `Open chat ${chat.title}`);
+            if (chat.id === activeChatId) content.setAttribute("aria-current", "page");
             title.textContent = chat.title;
             meta.className = "chat-item-meta";
             const chatType = chat.assistant_persona_id
@@ -1102,19 +1197,23 @@ function renderChatList() {
             remove.setAttribute("aria-label", `Delete chat ${chat.title}`);
             remove.addEventListener("click", async (event) => {
                 event.stopPropagation();
+                closeMobileSidebar();
                 await deleteChat(chat.id);
             });
             content.append(title, meta);
+            if (query && chat.matched_content) {
+                const excerpt = document.createElement("small");
+                const normalized = chat.matched_content.replace(/\s+/g, " ");
+                const matchAt = normalized.toLowerCase().indexOf(query);
+                const start = Math.max(0, matchAt - 35);
+                excerpt.className = "chat-item-excerpt";
+                excerpt.textContent = `${start ? "…" : ""}${normalized.slice(start, start + 110)}${normalized.length > start + 110 ? "…" : ""}`;
+                content.append(excerpt);
+            }
             item.append(content, remove);
-            item.addEventListener("click", () => {
+            content.addEventListener("click", () => {
                 closeMobileSidebar();
-                setActiveChat(chat.id);
-            });
-            item.addEventListener("keydown", (event) => {
-                if (event.key !== "Enter" && event.key !== " ") return;
-                event.preventDefault();
-                closeMobileSidebar();
-                void setActiveChat(chat.id);
+                void setActiveChat(chat.id, {matchMessageId: query ? chat.matched_message_id : null});
             });
             list.appendChild(item);
         });
@@ -1131,7 +1230,7 @@ function updateActivePersonaStatus(items, activeId, statusEl, emptyText, prefix)
 function openPersonaForm(persona = null, personaType = "assistant") {
     closeChatDrawer();
     closePopup(false);
-    personaModal.classList.remove("hidden");
+    openModal(personaModal, personaNameInput);
     if (persona) {
         editingPersonaId = persona.id; editingPersonaType = persona.persona_type || "assistant";
         personaFormTitle.textContent = `Edit ${editingPersonaType === "user" ? "your persona" : "AI Character"}`;
@@ -1151,7 +1250,7 @@ function openPersonaForm(persona = null, personaType = "assistant") {
     personaNameInput.focus();
 }
 
-function closePersonaForm() { personaModal.classList.add("hidden"); editingPersonaId = null; editingPersonaType = "assistant"; personaTypeSelect.disabled = false; setPersonaFormNotice(""); }
+function closePersonaForm() { closeModal(personaModal); editingPersonaId = null; editingPersonaType = "assistant"; personaTypeSelect.disabled = false; setPersonaFormNotice(""); }
 function populateRoleplayStarter() {
     if (!roleplayCharacterSelect || !roleplayUserPersonaSelect) return;
     roleplayCharacterSelect.innerHTML = "";
@@ -1200,12 +1299,11 @@ function openRoleplayStarter(characterId = null) {
     populateRoleplayStarter();
     if (roleplayScenarioInput) roleplayScenarioInput.value = "";
     setRoleplayStarterNotice("");
-    roleplayStarterModal.classList.remove("hidden");
-    if (roleplayCharacterSelect.options.length) roleplayCharacterSelect.focus();
+    openModal(roleplayStarterModal, roleplayCharacterSelect);
 }
 function closeRoleplayStarter() {
     if (!roleplayStarterModal) return;
-    roleplayStarterModal.classList.add("hidden");
+    closeModal(roleplayStarterModal);
     roleplayPresetCharacterId = null;
     roleplayStarterStep = 1;
     roleplayStarterConfirm.disabled = false;
@@ -1234,7 +1332,7 @@ function finishPopup(result) {
 }
 function closePopup(resolveValue = null) {
     if (!popupModal || popupModal.classList.contains("hidden")) return;
-    popupModal.classList.add("hidden");
+    closeModal(popupModal);
     popupField.classList.add("hidden");
     popupInput.value = "";
     popupConfirmBtn.disabled = false;
@@ -1262,7 +1360,7 @@ function openPopup(options) {
     } else {
         popupInput.value = "";
     }
-    popupModal.classList.remove("hidden");
+    openModal(popupModal, options.mode === "prompt" ? popupInput : popupConfirmBtn);
     return new Promise((resolve) => {
         popupResolver = resolve;
         requestAnimationFrame(() => {
@@ -1405,6 +1503,9 @@ function setLoadingState(loading, overlayOptions = null) {
     messagesDiv.querySelectorAll('[data-message-action="regenerate"]').forEach((button) => {
         button.disabled = loading || button.dataset.retryLimitReached === "true";
     });
+    messagesDiv.querySelectorAll('[data-message-action="retry-failed"]').forEach((button) => {
+        button.disabled = loading;
+    });
     if (loading) {
         msgInput.placeholder = "Processing response...";
         if (overlayOptions === false) {
@@ -1427,8 +1528,21 @@ async function stopGeneration() {
     setNotice(res.stopped ? "Stopping generation..." : "Generation already finished.");
 }
 
-async function setActiveChat(id, {preserveComposer = false} = {}) {
-    if (!preserveComposer && id !== activeChatId) attachmentComposer.discard();
+async function setActiveChat(id, {preserveComposer = false, matchMessageId = null} = {}) {
+    const openRequest = ++chatOpenRequest;
+    if (!preserveComposer && id !== activeChatId) {
+        if (activeChatId != null) {
+            chatDrafts.set(activeChatId, msgInput.value);
+            attachmentComposer.saveDraft(activeChatId);
+            msgInput.value = chatDrafts.get(id) || "";
+            attachmentComposer.restoreDraft(id);
+            resizeComposerInput();
+        } else if (!msgInput.value && !attachmentComposer.pending && !attachmentComposer.attachments.length) {
+            msgInput.value = chatDrafts.get(id) || "";
+            attachmentComposer.restoreDraft(id);
+            resizeComposerInput();
+        }
+    }
     if (isMobileLayout()) closeMobileSidebar();
     setChatLoading(true, "Opening chat...");
     setChatActivity(true, {
@@ -1440,16 +1554,27 @@ async function setActiveChat(id, {preserveComposer = false} = {}) {
     history.replaceState(null, "", `/app/chats/${id}`);
     messageRetryState = new Map();
     updateWorkspaceCopy(); renderChatList(); updateChatActionState();
-    const res = await get(`/chats/${id}/messages`);
+    let res = await get(`/chats/${id}/messages`);
+    if (openRequest !== chatOpenRequest) { setChatLoading(false); setChatActivity(false); return; }
     if (res.error) {
         setChatLoading(false);
         setChatActivity(false);
         return setNotice(res.error, "error");
     }
+    if (matchMessageId && !res.messages?.some(message => message.id === matchMessageId)) {
+        const activated = await post(`/chats/${id}/branches/${matchMessageId}/activate`, {includeDescendants: true});
+        if (!activated.error) res = await get(`/chats/${id}/messages`);
+        if (openRequest !== chatOpenRequest) { setChatLoading(false); setChatActivity(false); return; }
+    }
     const existing = getChatById(id);
     if (res.chat && existing) Object.assign(existing, res.chat);
     populateGenerationSettings(res.chat || existing);
     currentMessages = res.messages || []; renderMessages();
+    if (matchMessageId) requestAnimationFrame(() => {
+        const target = [...messagesDiv.querySelectorAll("[data-message-id]")]
+            .find(node => Number(node.dataset.messageId) === Number(matchMessageId));
+        if (target) { target.scrollIntoView({block: "center"}); updateJumpToLatest(); }
+    });
     updateSendState();
     setChatLoading(false);
     setChatActivity(false);
@@ -1457,13 +1582,17 @@ async function setActiveChat(id, {preserveComposer = false} = {}) {
 
 async function loadChatSessions() {
     setChatLoading(true, "Loading chats...");
-    const query = chatSearchInput?.value.trim();
-    const res = query ? await get(`/chats/search?q=${encodeURIComponent(query)}`) : await get("/chats");
+    const res = await get("/chats");
     if (res.error) {
         setChatLoading(false);
         return setNotice(res.error, "error");
     }
     chatSessions = res.chats || []; renderChatList();
+    if (activeChatId && getChatById(activeChatId)) {
+        updateWorkspaceCopy();
+        setChatLoading(false);
+        return;
+    }
     if (location.pathname.endsWith("/new") && !activeChatId) { currentMessages = []; renderMessages(); updateWorkspaceCopy(); updateSendState(); setChatLoading(false); return; }
     if (requestedChatId && !getChatById(requestedChatId) && !activeChatId) { setChatLoading(false); return setNotice("Conversation not found. Choose a chat from the sidebar or start a new one.", "error"); }
     if (chatSessions.length) {
@@ -1480,8 +1609,34 @@ async function loadChatSessions() {
     return setNotice("Pick a starting action to begin.", "success");
 }
 
+async function searchChatSessions(query, requestId) {
+    const res = await get(`/chats/search?q=${encodeURIComponent(query)}`);
+    if (requestId !== chatSearchRequest || chatSearchInput.value.trim() !== query) return;
+    if (res.error) {
+        chatSearchError = "Unable to search chats.";
+        renderChatList();
+        setNotice(res.error, "error");
+        return;
+    }
+    chatSearchResults = res.chats || [];
+    renderChatList();
+}
+
+function scheduleChatSearch() {
+    clearTimeout(chatSearchTimer);
+    const requestId = ++chatSearchRequest;
+    const query = chatSearchInput.value.trim();
+    chatSearchResults = null;
+    chatSearchError = "";
+    if (!query) {
+        renderChatList();
+        return;
+    }
+    renderChatList();
+    chatSearchTimer = setTimeout(() => { void searchChatSessions(query, requestId); }, 300);
+}
+
 async function createNewChat({preserveComposer = false} = {}) {
-    if (!preserveComposer) attachmentComposer.discard();
     setChatLoading(true, "Creating chat...");
     setChatActivity(true, {
         eyebrow: "Creating chat",
@@ -1629,18 +1784,18 @@ function exportCurrentChat() {
 }
 
 async function backupWorkspace() {
-    const response = await fetch("/exports/workspace");
-    const data = await response.json();
-    const blob = new Blob([JSON.stringify(data.workspace, null, 2)], { type: "application/json;charset=utf-8" });
+    const response = await fetch("/exports/workspace/archive");
+    if (!response.ok) return setNotice("Workspace archive could not be created.", "error");
+    const blob = await response.blob();
     const url = URL.createObjectURL(blob);
     const link = document.createElement("a");
     link.href = url;
-    link.download = `workspace-backup-${new Date().toISOString().slice(0, 10)}.json`;
+    link.download = `workspace-backup-${new Date().toISOString().slice(0, 10)}.tar.gz`;
     document.body.appendChild(link);
     link.click();
     link.remove();
     URL.revokeObjectURL(url);
-    setNotice("Workspace backup downloaded.", "success");
+    setNotice("Workspace archive downloaded with images.", "success");
 }
 
 function formatImportPreview(preview, warnings = []) {
@@ -1657,6 +1812,31 @@ function formatImportPreview(preview, warnings = []) {
 async function importWorkspaceFromFile(file) {
     if (!file) return;
     setChatLoading(true, "Reading workspace backup...");
+    const isArchive = file.name.toLowerCase().endsWith(".tar.gz");
+    if (isArchive) {
+        const submit = async (path, allowDuplicates = false) => {
+            const body = new FormData();
+            body.append("archive", file);
+            if (allowDuplicates) body.append("allowDuplicates", "true");
+            const response = await fetch(path, {method: "POST", body});
+            return response.json();
+        };
+        try {
+            const preview = await submit("/imports/workspace/archive/preview");
+            setChatLoading(false);
+            if (preview.error || preview.ok === false) return setNotice((preview.errors || []).slice(0, 4).join("; ") || preview.error || "Invalid archive.", "error");
+            const confirmed = await confirmPopup({eyebrow: "Workspace import", title: "Review import",
+                description: formatImportPreview(preview.preview || {}, preview.warnings || []), confirmLabel: "Import"});
+            if (!confirmed) return;
+            setChatLoading(true, "Importing workspace and images...");
+            const result = await submit("/imports/workspace/archive", Boolean(preview.preview?.duplicates?.length));
+            if (result.error) return setNotice(result.error, "error");
+            await Promise.all([loadPersonas(), loadChatSessions()]);
+            setNotice(`Workspace imported: ${result.imported.chats} chats with their images.`, "success");
+        } catch { setNotice("Workspace archive could not be imported.", "error"); }
+        finally { setChatLoading(false); }
+        return;
+    }
     let workspace;
     try {
         workspace = JSON.parse(await file.text());
@@ -1801,7 +1981,9 @@ async function deleteChat(id) {
         return setNotice(res.error, "error");
     }
     chatSessions = chatSessions.filter((item) => item.id !== id);
-    if (activeChatId === id) { activeChatId = null; currentMessages = []; renderMessages(); }
+    chatDrafts.delete(id);
+    attachmentComposer.discardDraft(id);
+    if (activeChatId === id) { attachmentComposer.discard(); msgInput.value = ""; activeChatId = null; currentMessages = []; renderMessages(); }
     messageRetryState = new Map();
     await loadSummary(); renderChatList();
     if (chatSessions.length) await setActiveChat(chatSessions[0].id); else await createNewChat();
@@ -1846,15 +2028,21 @@ async function checkSession() {
     // Starters are offered on workspace home.
     const starter = new URLSearchParams(location.search).get("prompt");
     if (starter) { msgInput.value = starter; resizeComposerInput(); updateSendState(); }
-    msgInput.focus(); return true;
+    msgInput.focus();
+    if (!starter && !activeChatId) maybeShowOnboarding();
+    return true;
 }
 
-async function sendMessage() {
+async function sendMessage({ retryMessage = null } = {}) {
     if (isProcessing) return;
     if (attachmentComposer.pending) return;
-    const attachments = attachmentComposer.attachments;
-    const message = msgInput.value.trim() || (attachments.length ? "Describe the attached images." : "");
+    const attachments = retryMessage?.attachments || attachmentComposer.attachments;
+    const message = retryMessage?.content || msgInput.value.trim() || (attachments.length ? "Describe the attached images." : "");
     if (!message) return;
+    if (retryMessage && !msgInput.value.trim()) {
+        msgInput.value = message;
+        resizeComposerInput();
+    }
     const webSearch = webSearchToggle.enabled;
     const reasoning = reasoningToggle.enabled;
     if (!activeChatId) await createNewChat({preserveComposer: true});
@@ -1865,25 +2053,31 @@ async function sendMessage() {
         currentChat.title = autoTitle; updateWorkspaceCopy(); renderChatList(); await put(`/chats/${activeChatId}`, { title: autoTitle });
     }
     const userMessage = { role: "user", content: message, attachments };
-    currentMessages.push(userMessage); addMessage(userMessage, true); updateChatActionState();
-    msgInput.value = "";
-    resizeComposerInput();
+    currentMessages.push(userMessage);
+    const userCard = addMessage(userMessage, true);
+    updateChatActionState();
     setLoadingState(true, false); setNotice("Generating reply...");
     const loadingMsg = addMessage({ role: "bot", content: "" }, false, true, { isNewest: true });
     const loadingBody = loadingMsg.querySelector(".msg-content");
     const loadingShell = loadingMsg.querySelector(".loading-shell");
     const loadingLabel = loadingMsg.querySelector(".loading-copy strong");
     loadingLabel.textContent = "Preparing response...";
+    const showSendFailure = (errorMessage) => {
+        if (!msgInput.value.trim()) {
+            msgInput.value = message;
+            resizeComposerInput();
+        }
+        userMessage.deliveryStatus = "failed";
+        userMessage.errorMessage = errorMessage;
+        userCard.replaceWith(addMessage(userMessage, true, false, { detached: true }));
+        setNotice(errorMessage, "error");
+    };
+    let completedReply = null;
     try {
         let streamError = null;
         await stream("/chat/stream", { message, attachments: attachments.map(item => item.id), model: modelSelect.value, chatId: activeChatId, webSearch, reasoning }, {
             onStatus: ({ status, sourceCount, searchState }) => {
-                if (status === "accepted") {
-                    attachmentComposer.clear();
-                    webSearchToggle.reset();
-                    reasoningToggle.reset();
-                    return;
-                }
+                if (status === "accepted") return;
                 loadingLabel.textContent = status === "analyzing" ? "Analyzing images..." : status === "searching" ? "Searching the web..."
                     : searchState === "no_relevant_results" ? "No sufficiently relevant results. Generating response..."
                         : sourceCount === 0 ? "No web results found. Generating response..." : "Generating response...";
@@ -1906,7 +2100,10 @@ async function sendMessage() {
                 }
                 if (follow) scrollMessagesToBottom();
             },
-            onDone: () => { webSearchToggle.reset(); reasoningToggle.reset(); finishReasoning(loadingMsg); },
+            onDone: ({ reply }) => {
+                completedReply = reply;
+                webSearchToggle.reset(); reasoningToggle.reset(); finishReasoning(loadingMsg);
+            },
             onError: ({ error }) => {
                 streamError = error || "Failed to generate reply.";
             }
@@ -1915,14 +2112,16 @@ async function sendMessage() {
         const previousScrollTop = messagesDiv.scrollTop;
         if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
         if (streamError) {
-            if (webSearch) {
-                msgInput.value = message;
-                resizeComposerInput();
-            }
-            addMessage(`[Error: ${streamError}]`);
-            setNotice(streamError, "error");
+            showSendFailure(streamError);
             return;
         }
+        if (msgInput.value.trim() === message) {
+            msgInput.value = "";
+            resizeComposerInput();
+        }
+        const composerAttachments = attachmentComposer.attachments;
+        if (composerAttachments.length === attachments.length
+            && composerAttachments.every((item, index) => item.id === attachments[index].id)) attachmentComposer.clear();
         await setActiveChat(activeChatId);
         await loadSummary();
         markOnboardingCompleted();
@@ -1931,12 +2130,16 @@ async function sendMessage() {
         setNotice("Reply received.", "success");
     } catch (error) {
         if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
-        if (webSearch) {
-            msgInput.value = message;
-            resizeComposerInput();
-        }
         const errorMessage = error?.message || "Network error while sending message.";
-        addMessage(`[Error: ${errorMessage}]`); setNotice(errorMessage, "error");
+        if (completedReply !== null) {
+            if (userCard.isConnected) {
+                currentMessages.push({ role: "bot", content: completedReply });
+                addMessage(completedReply);
+            }
+            setNotice(`Reply sent, but the conversation could not be refreshed: ${errorMessage}`, "error");
+        } else {
+            showSendFailure(errorMessage);
+        }
     } finally {
         setLoadingState(false); msgInput.focus(); updateChatActionState();
     }
@@ -1993,7 +2196,7 @@ function bindChatDrawerActions() {
 }
 
 sendBtn.addEventListener("click", () => { void (isProcessing ? stopGeneration() : sendMessage()); });
-msgInput.addEventListener("keydown", (event) => { if (event.key === "Enter" && !event.shiftKey) { event.preventDefault(); void sendMessage(); } });
+msgInput.addEventListener("keydown", (event) => { if (event.key === "Enter" && !event.shiftKey && !event.isComposing) { event.preventDefault(); void sendMessage(); } });
 msgInput.addEventListener("input", function () {
     resizeComposerInput();
     updateSendState();
@@ -2016,7 +2219,7 @@ if (importWorkspaceBtn) importWorkspaceBtn.addEventListener("click", () => {
 if (importWorkspaceFileInput) importWorkspaceFileInput.addEventListener("change", () => {
     void importWorkspaceFromFile(importWorkspaceFileInput.files?.[0]);
 });
-chatSearchInput.addEventListener("input", () => { void loadChatSessions(); });
+chatSearchInput.addEventListener("input", scheduleChatSearch);
 modelSelect.addEventListener("change", () => {
     renderModelSection();
     void saveSelectedModel();
@@ -2026,7 +2229,7 @@ if (headerModelButton) headerModelButton.addEventListener("click", (event) => {
     openModelSettings();
 });
 saveGenerationSettingsBtn.addEventListener("click", () => { void saveGenerationSettings(); });
-roleplayNewPersonaBtn.addEventListener("click", () => openPersonaForm(null, "assistant"));
+roleplayNewPersonaBtn.addEventListener("click", () => { closeRoleplayStarter(); openPersonaForm(null, "assistant"); });
 clearUserPersonaBtn.addEventListener("click", () => {
     closeChatDrawer();
     void clearPersona("user");
@@ -2069,9 +2272,11 @@ popupInput.addEventListener("keydown", (event) => {
     }
 });
 bindChatDrawerActions();
+if (chatSidebar) chatSidebar.inert = isMobileLayout();
 if (chatSidebar) {
     chatSidebar.addEventListener("click", (event) => event.stopPropagation());
 }
+document.getElementById("chatSidebarBackdrop")?.addEventListener("click", closeMobileSidebar);
 if (chatSidebarToggle) {
     chatSidebarToggle.addEventListener("click", (event) => {
         event.stopPropagation();
@@ -2086,12 +2291,14 @@ if (onboardingContinue) {
     onboardingContinue.addEventListener("click", () => {
         onboardingStep = 2;
         renderOnboardingStep();
+        onboardingChoices.querySelector("button")?.focus();
     });
 }
 if (onboardingBack) {
     onboardingBack.addEventListener("click", () => {
         onboardingStep = 1;
         renderOnboardingStep();
+        (onboardingChoices.querySelector(".active") || onboardingChoices.querySelector("button"))?.focus();
     });
 }
 if (onboardingSkip) {
@@ -2102,14 +2309,42 @@ if (onboardingModal) {
         if (event.target === onboardingModal) markOnboardingCompleted();
     });
 }
-document.addEventListener("click", () => {
+document.addEventListener("click", (event) => {
+    if (!event.target.closest(".msg-action-menu")) {
+        document.querySelectorAll(".msg-action-menu[open]").forEach((menu) => { menu.open = false; });
+    }
     closeMobileSidebar();
 });
 window.addEventListener("resize", () => {
     if (!isMobileLayout()) closeMobileSidebar();
+    if (chatSidebar) chatSidebar.inert = isMobileLayout() && !document.body.classList.contains("sidebar-open");
 });
 document.addEventListener("keydown", (event) => {
+    if (event.key === "Tab" && isMobileLayout() && document.body.classList.contains("sidebar-open")) {
+        const focusables = [...chatSidebar.querySelectorAll('button:not([disabled]), input:not([disabled]), [tabindex="0"]')]
+            .filter((element) => !element.hidden && !element.closest("[hidden]"));
+        const first = focusables[0], last = focusables.at(-1);
+        if (event.shiftKey && (document.activeElement === first || !chatSidebar.contains(document.activeElement))) {
+            event.preventDefault(); last?.focus();
+        } else if (!event.shiftKey && (document.activeElement === last || !chatSidebar.contains(document.activeElement))) {
+            event.preventDefault(); first?.focus();
+        }
+    }
     if (event.key === "Escape") {
+        const activeModal = topModal();
+        if (activeModal) {
+            event.preventDefault();
+            if (activeModal === popupModal) closePopup(false);
+            else if (activeModal === personaModal) closePersonaForm();
+            else if (activeModal === roleplayStarterModal) closeRoleplayStarter();
+            else if (activeModal === onboardingModal) closeOnboarding();
+            return;
+        }
+        const openMenu = document.querySelector(".msg-action-menu[open]");
+        if (openMenu) {
+            openMenu.open = false;
+            openMenu.querySelector("summary")?.focus();
+        }
         closeMobileSidebar();
         closeRoleplayStarter();
         closePersonaForm();
diff --git a/public/js/settings.js b/public/js/settings.js
index 279fed9..8237117 100644
--- a/public/js/settings.js
+++ b/public/js/settings.js
@@ -1,4 +1,7 @@
-import { del, get, post, put } from "./api.js?v=20260909-account-controls";
+/**
+ * @file Steuert die Einstellungsoberfläche für Darstellung, Konto, Personas und Diagnosen.
+ */
+import { del, get, post, put, request } from "./api.js?v=20260909-account-controls";
 import {
     applyTheme as applySharedTheme,
     applyThemeMode as applySharedThemeMode,
@@ -6,6 +9,7 @@ import {
 } from "./themeController.js?v=20260909-account-controls";
 import { clearStatus, setStatus } from "./statusNotice.js?v=20260909-account-controls";
 import { populatePersonaForm, readPersonaForm } from "./personaForm.js?v=20260909-account-controls";
+import { openModal, closeModal, topModal } from "./modalFocus.js";
 
 const $ = (id) => document.getElementById(id);
 const settingsNotice = $("settingsNotice");
@@ -62,7 +66,6 @@ const settingsPopupConfirm = $("settingsPopupConfirm");
 const settingsPopupTitle = $("settingsPopupTitle");
 const settingsPopupEyebrow = $("settingsPopupEyebrow");
 const settingsPopupDescription = $("settingsPopupDescription");
-const settingsPopupField = $("settingsPopupField");
 const settingsPopupInputLabel = $("settingsPopupInputLabel");
 const settingsPopupInput = $("settingsPopupInput");
 const settingsPersonaFields = {
@@ -94,7 +97,7 @@ function setPersonaNotice(message = "", state = "") {
 }
 
 function closeSettingsPopup(value = null) {
-    settingsPopupModal.classList.add("hidden");
+    closeModal(settingsPopupModal);
     if (settingsPopupResolver) {
         const resolve = settingsPopupResolver;
         settingsPopupResolver = null;
@@ -118,7 +121,7 @@ function promptSettingsPopup({
     settingsPopupInput.value = value;
     settingsPopupInput.placeholder = placeholder;
     settingsPopupConfirm.textContent = confirmLabel;
-    settingsPopupModal.classList.remove("hidden");
+    openModal(settingsPopupModal, settingsPopupInput);
     settingsPopupInput.focus();
     settingsPopupInput.select();
     return new Promise((resolve) => {
@@ -230,12 +233,11 @@ function openPersonaModal(persona = null, personaType = "assistant") {
     populatePersonaForm(settingsPersonaFields, persona || {});
     syncPersonaExamplesField();
     setPersonaNotice("");
-    settingsPersonaModal.classList.remove("hidden");
-    settingsPersonaName.focus();
+    openModal(settingsPersonaModal, settingsPersonaName);
 }
 
 function closePersonaModal() {
-    settingsPersonaModal.classList.add("hidden");
+    closeModal(settingsPersonaModal);
     editingPersonaId = null;
     setPersonaNotice("");
 }
@@ -497,9 +499,8 @@ usernameForm.addEventListener("submit", async (event) => {
         setNotice(res.error, "error");
         return;
     }
-    currentUsernameInput.value = res.username;
-    newUsernameInput.value = res.username;
     usernamePasswordInput.value = "";
+    if (!await loadProfile()) return;
     setNotice("Username updated.", "success");
 });
 
@@ -570,9 +571,18 @@ settingsPopupInput.addEventListener("keydown", (event) => {
     }
     if (event.key === "Escape") {
         event.preventDefault();
+        event.stopPropagation();
         closeSettingsPopup(null);
     }
 });
+document.addEventListener("keydown", event => {
+    if (event.key !== "Escape") return;
+    const modal = topModal();
+    if (!modal) return;
+    event.preventDefault();
+    if (modal === settingsPopupModal) closeSettingsPopup(null);
+    else if (modal === settingsPersonaModal) closePersonaModal();
+});
 
 window.addEventListener("load", async () => {
     initializeAppearance({ title: "Elsewhere Settings", themeSelect: settingsThemeSelect, modeSelect: themeModeSelect });
diff --git a/public/js/statusNotice.js b/public/js/statusNotice.js
index f25bb42..7fbcfb1 100644
--- a/public/js/statusNotice.js
+++ b/public/js/statusNotice.js
@@ -1,3 +1,6 @@
+/**
+ * @file Zeigt Statusmeldungen an und setzt deren Inhalt und Sichtbarkeit zurück.
+ */
 export function setStatus(element, message = "", state = "", baseClass = "status") {
     if (!element) return;
     element.textContent = message;
diff --git a/public/js/theme-bootstrap.js b/public/js/theme-bootstrap.js
index 105c081..ddf5518 100644
--- a/public/js/theme-bootstrap.js
+++ b/public/js/theme-bootstrap.js
@@ -1,3 +1,6 @@
+/**
+ * @file Übernimmt das gespeicherte Theme frühzeitig in das Dokument, bevor die übrige Oberfläche initialisiert wird.
+ */
 (() => {
     const themes = new Set(["fakegpt", "fraud", "germini", "slopilot", "beta-ai", "confusity"]);
     const storedTheme = localStorage.getItem("krishd-theme");
diff --git a/public/js/themeController.js b/public/js/themeController.js
index bb05c71..99c292e 100644
--- a/public/js/themeController.js
+++ b/public/js/themeController.js
@@ -1,3 +1,6 @@
+/**
+ * @file Normalisiert, speichert und synchronisiert Theme und Hell-Dunkel-Modus der Oberfläche.
+ */
 import {themes} from "./constants.js?v=20260909-account-controls";
 
 export const THEME_STORAGE_KEY = "krishd-theme";
diff --git a/public/js/webSearch.js b/public/js/webSearch.js
index 6b1355a..8fef8b0 100644
--- a/public/js/webSearch.js
+++ b/public/js/webSearch.js
@@ -1,3 +1,6 @@
+/**
+ * @file Steuert die Websuche-Auswahl und rendert Quellenlinks zu Chat-Antworten.
+ */
 /** @typedef {{title: string, url: string, snippet: string}} WebSource */
 /** @typedef {{message: string, model: string, chatId: number, webSearch?: boolean, reasoning?: boolean}} ChatRequest */
 /** @typedef {{role: string, content: string, thinking?: string, sources?: WebSource[]}} ChatMessage */
diff --git a/public/js/workspaceNavigation.js b/public/js/workspaceNavigation.js
index c19b859..44536c6 100644
--- a/public/js/workspaceNavigation.js
+++ b/public/js/workspaceNavigation.js
@@ -1,4 +1,7 @@
-import {post} from './api.js?v=20260909-account-controls';
+/**
+ * @file Verbindet die Abmeldeknöpfe des gemeinsamen Seitenkopfs mit der Sitzungsverwaltung.
+ */
+import {post} from './api.js?v=20260909-account-controls';
 
 // Every page gets this control from the same server-rendered header.
 for (const button of document.querySelectorAll('[data-sign-out]')) {
diff --git a/public/market.html b/public/market.html
index 4b27c56..7768b4f 100644
--- a/public/market.html
+++ b/public/market.html
@@ -102,7 +102,7 @@
     </main>
 
     <div id="marketPreviewModal" class="modal-overlay hidden">
-        <div class="modal-card market-preview-card">
+        <div class="modal-card market-preview-card" role="dialog" aria-modal="true" aria-labelledby="marketPreviewTitle" tabindex="-1">
             <div class="modal-header">
                 <div>
                     <p class="eyebrow">Persona preview</p>
@@ -162,7 +162,7 @@
     </div>
 
     <div id="marketPersonaModal" class="modal-overlay hidden">
-        <div class="modal-card persona-modal-card">
+        <div class="modal-card persona-modal-card" role="dialog" aria-modal="true" aria-labelledby="marketPersonaFormTitle" tabindex="-1">
             <div class="modal-header">
                 <div class="persona-modal-heading">
                     <p class="eyebrow">AI Character editor</p>
diff --git a/public/settings.html b/public/settings.html
index 9bded4f..fe71b4c 100644
--- a/public/settings.html
+++ b/public/settings.html
@@ -232,7 +232,7 @@
     </main>
 
     <div id="settingsPersonaModal" class="modal-overlay hidden">
-        <div class="modal-card persona-modal-card">
+        <div class="modal-card persona-modal-card" role="dialog" aria-modal="true" aria-labelledby="settingsPersonaFormTitle" tabindex="-1">
             <div class="modal-header">
                 <div class="persona-modal-heading">
                     <p class="eyebrow">Persona editor</p>
@@ -317,7 +317,7 @@
             </div>
         </div>
     </div>
-    <script type="module" src="/js/settings.js?v=20260923-asset-paths"></script>
+    <script type="module" src="/js/settings.js?v=20260930-account-fixes"></script>
     <script type="module" src="/js/workspaceNavigation.js?v=20260909-account-controls"></script>
 </body>
 
diff --git a/server.js b/server.js
index d91b2f7..4beb6e7 100644
--- a/server.js
+++ b/server.js
@@ -1,3 +1,6 @@
+/**
+ * @file Startet den HTTP-Server der Chat-Anwendung.
+ */
 import {startServer} from "./src/app.js";
 
 startServer();
diff --git a/src/app.js b/src/app.js
index 972112b..33ee7be 100644
--- a/src/app.js
+++ b/src/app.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verbindet Express, Sitzungen, Datenbank und Routen und verwaltet den Server-Lebenszyklus.
+ */
 import fs from "fs";
 import {randomUUID} from "crypto";
 import {performance} from "perf_hooks";
@@ -306,7 +309,7 @@ export function createApp(options = {}) {
     app.use(createUploadsRouter(attachmentService, config));
     if (config.visionDebug) app.use(createVisionDebugRouter({visionDebugService, repositories}));
     app.use(createSettingsRouter({repositories}));
-    app.use(createChatsRouter({repositories, chatService, modelService, config, chatRateLimiters}));
+    app.use(createChatsRouter({repositories, chatService, modelService, config, chatRateLimiters, attachmentService}));
     app.use(createPersonasRouter({repositories, chatService, modelService, config}));
     app.use(createSystemRouter({modelService, config}));
     app.use(notFoundHandler);
diff --git a/src/config.js b/src/config.js
index 2fb9829..4a8ae77 100644
--- a/src/config.js
+++ b/src/config.js
@@ -1,3 +1,6 @@
+/**
+ * @file Erstellt die Anwendungskonfiguration aus Umgebungsvariablen, Standardwerten und expliziten Vorgaben.
+ */
 import path from "path";
 
 const bool = (value, fallback = false) => {
diff --git a/src/db/attachments.js b/src/db/attachments.js
index 8075bdb..44ecc59 100644
--- a/src/db/attachments.js
+++ b/src/db/attachments.js
@@ -1,3 +1,6 @@
+/**
+ * @file Definiert Tabellen für Bildanhänge und Analyse-Caches und bereitet Anhangsmetadaten auf.
+ */
 export function initializeAttachments(db) {
     db.exec(`
         CREATE TABLE IF NOT EXISTS attachments (
diff --git a/src/db/index.js b/src/db/index.js
index 8d6f91a..d0ee081 100644
--- a/src/db/index.js
+++ b/src/db/index.js
@@ -1,3 +1,6 @@
+/**
+ * @file Öffnet die SQLite-Datenbank und initialisiert Tabellen sowie Migrationen.
+ */
 import fs from "fs";
 import Database from "better-sqlite3";
 import {initializeSchema, runMigrations} from "./schema.js";
diff --git a/src/db/repositories.js b/src/db/repositories.js
index 98d0987..c4f47f4 100644
--- a/src/db/repositories.js
+++ b/src/db/repositories.js
@@ -1,3 +1,6 @@
+/**
+ * @file Bündelt Datenbankzugriffe auf Konten, Chats, Nachrichten, Personas und den Marktplatz.
+ */
 import {attachmentMetadata} from "./attachments.js";
 
 const parseJsonArray = (value) => {
@@ -84,7 +87,7 @@ export function createRepositories(db, config) {
             WHERE cs.username = ?
             ORDER BY cs.is_pinned DESC, datetime(cs.updated_at) DESC
         `),
-        countChatSessions: db.prepare("SELECT COUNT(*) as count FROM chat_sessions WHERE username = ?"),
+        countChatSessions: db.prepare("SELECT COUNT(*) as count FROM chat_sessions WHERE username = ? AND archived_at IS NULL"),
         getChatSession: db.prepare(`
             SELECT cs.id,
                    CASE
@@ -378,7 +381,7 @@ export function createRepositories(db, config) {
         deleteChatMessage: db.prepare("DELETE FROM chat_messages WHERE id = ? AND chat_id = ?"),
         deleteChatMessages: db.prepare("DELETE FROM chat_messages WHERE chat_id = ?"),
         searchChats: db.prepare(`
-            SELECT DISTINCT cs.id,
+            SELECT cs.id,
                             CASE
                                 WHEN cs.assistant_persona_id IS NOT NULL AND cs.source_chat_id IS NULL THEN COALESCE(p.name, cs.title)
                                 ELSE cs.title
@@ -405,18 +408,23 @@ export function createRepositories(db, config) {
                             cs.system_instruction,
                             cs.created_at,
                             cs.updated_at,
+                            cm.id AS matched_message_id,
                             cm.content AS matched_content
             FROM chat_sessions cs
                      LEFT JOIN personas p ON p.id = cs.assistant_persona_id
                      LEFT JOIN personas up ON up.id = cs.user_persona_id
-                     LEFT JOIN chat_messages cm ON cm.chat_id = cs.id
+                     LEFT JOIN chat_messages cm ON cm.id = (
+                         SELECT m.id FROM chat_messages m
+                         WHERE m.chat_id = cs.id AND LOWER(m.content) LIKE ?
+                         ORDER BY m.id DESC LIMIT 1
+                     )
             WHERE cs.username = ?
               AND (
                 LOWER(CASE
                           WHEN cs.assistant_persona_id IS NOT NULL AND cs.source_chat_id IS NULL THEN COALESCE(p.name, cs.title)
                           ELSE cs.title
                     END) LIKE ?
-                    OR LOWER(COALESCE(cm.content, '')) LIKE ?
+                    OR cm.id IS NOT NULL
               )
             ORDER BY cs.is_pinned DESC, datetime(cs.updated_at) DESC
         `),
@@ -711,6 +719,9 @@ export function createRepositories(db, config) {
     };
 
     const renameUserTransaction = db.transaction((currentUsername, nextUsername) => {
+        // Existing username references do not all cascade on update. Check them at commit,
+        // after every owned row has been moved to the new username.
+        db.pragma("defer_foreign_keys = ON");
         statements.updateUsername.run(nextUsername, currentUsername);
         statements.updateChatSessionsUsername.run(nextUsername, currentUsername);
         statements.updatePersonasUsername.run(nextUsername, currentUsername);
@@ -876,9 +887,10 @@ export function createRepositories(db, config) {
                         .run(result.lastInsertRowid, version.content, version.thinking, JSON.stringify(version.sources), version.modelName, version.createdAt);
                 }
                 for (const [position, attachment] of (message.attachments || []).slice(0, config.uploadMaxFiles || 5).entries()) {
-                    // JSON backups contain references, not files. Only restore existing, owned images.
-                    db.prepare("INSERT OR IGNORE INTO message_attachments(message_id,attachment_id,position) SELECT ?,id,? FROM attachments WHERE id=? AND username=? AND status='attached'")
+                    // JSON imports reconnect owned images; archive imports also reconnect newly restored images.
+                    db.prepare("INSERT OR IGNORE INTO message_attachments(message_id,attachment_id,position) SELECT ?,id,? FROM attachments WHERE id=? AND username=? AND status IN ('temporary','attached')")
                         .run(result.lastInsertRowid, position, attachment.id, username);
+                    db.prepare("UPDATE attachments SET status='attached' WHERE id=? AND username=?").run(attachment.id, username);
                 }
             }
             statements.updateChatGenerationSettings.run(
@@ -942,7 +954,7 @@ export function createRepositories(db, config) {
         listChats: (username) => statements.listChatSessions.all(username),
         searchChats(username, query) {
             const like = `%${String(query || "").trim().toLowerCase()}%`;
-            return statements.searchChats.all(username, like, like);
+            return statements.searchChats.all(like, username, like);
         },
         countChats: (username) => statements.countChatSessions.get(username).count,
         getChat: (chatId, username) => statements.getChatSession.get(chatId, username),
diff --git a/src/db/schema.js b/src/db/schema.js
index bef91af..b9724c4 100644
--- a/src/db/schema.js
+++ b/src/db/schema.js
@@ -1,3 +1,6 @@
+/**
+ * @file Definiert das Datenbankschema und migriert bestehende Daten auf die benötigte Struktur.
+ */
 export function initializeSchema(db) {
     db.pragma("journal_mode = WAL");
     db.pragma("foreign_keys = ON");
diff --git a/src/middleware/auth.js b/src/middleware/auth.js
index eadd3be..bd16d6f 100644
--- a/src/middleware/auth.js
+++ b/src/middleware/auth.js
@@ -1,3 +1,6 @@
+/**
+ * @file Schützt Routen vor Zugriffen ohne angemeldete Sitzung.
+ */
 export function requireLogin(req, res, next) {
     if (!req.session.user) {
         return res.status(403).json({error: "Not logged in"});
diff --git a/src/middleware/rateLimit.js b/src/middleware/rateLimit.js
index cf915f1..ef5cf81 100644
--- a/src/middleware/rateLimit.js
+++ b/src/middleware/rateLimit.js
@@ -1,3 +1,6 @@
+/**
+ * @file Begrenzt Anfragen je Schlüssel in einem gleitenden Zeitfenster und entfernt abgelaufene Einträge.
+ */
 function pruneBucket(bucket, windowMs, now) {
     const cutoff = now - windowMs;
     while (bucket.length && bucket[0] <= cutoff) {
@@ -21,6 +24,7 @@ export function createRateLimiter({windowMs, max, keyGenerator, message, cleanup
 
     if (cleanupIntervalMs > 0) {
         cleanupTimer = setInterval(cleanup, cleanupIntervalMs);
+        // Der Aufräumtimer allein soll den Node-Prozess beim Herunterfahren nicht offen halten.
         cleanupTimer.unref();
     }
 
diff --git a/src/middleware/rateLimiters.js b/src/middleware/rateLimiters.js
index 41f0d19..d4a85f8 100644
--- a/src/middleware/rateLimiters.js
+++ b/src/middleware/rateLimiters.js
@@ -1,3 +1,6 @@
+/**
+ * @file Erstellt die konfigurierten Anfragebegrenzungen für Anmeldung und Chat-Nutzung.
+ */
 import {createRateLimiter} from "./rateLimit.js";
 
 export function createAuthRateLimiters(config) {
diff --git a/src/middleware/validate.js b/src/middleware/validate.js
index 03d2603..c6ae704 100644
--- a/src/middleware/validate.js
+++ b/src/middleware/validate.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Anfrageinhalte mit einem übergebenen Validator und stellt die validierten Daten für Routen bereit.
+ */
 export function validateBody(validator) {
     return (req, res, next) => {
         const result = validator(req.body || {}, req);
diff --git a/src/pageLayout.js b/src/pageLayout.js
index 4f01de8..4ca9143 100644
--- a/src/pageLayout.js
+++ b/src/pageLayout.js
@@ -1,3 +1,6 @@
+/**
+ * @file Erzeugt den gemeinsamen HTML-Seitenkopf mit Navigation und Kontosteuerung.
+ */
 const escapeHtml = (value) => String(value).replace(/[&<>"']/g, (character) => ({
     "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;"
 })[character]);
diff --git a/src/routes/auth.js b/src/routes/auth.js
index b79e37f..911a137 100644
--- a/src/routes/auth.js
+++ b/src/routes/auth.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verarbeitet Registrierung, Anmeldung, Abmeldung und die Abfrage der aktuellen Sitzung.
+ */
 import express from "express";
 import bcrypt from "bcrypt";
 import {validateBody} from "../middleware/validate.js";
diff --git a/src/routes/chats.js b/src/routes/chats.js
index 8abfbdf..1f92f12 100644
--- a/src/routes/chats.js
+++ b/src/routes/chats.js
@@ -1,7 +1,12 @@
+/**
+ * @file Stellt Chat-Routen für Nachrichten, Streaming, Antwortvarianten, Verzweigungen und Einstellungen bereit.
+ */
 import express from "express";
+import multer from "multer";
 import {requireLogin} from "../middleware/auth.js";
 import {validateBody} from "../middleware/validate.js";
 import {validateWorkspaceImport} from "../services/workspaceImportService.js";
+import {createWorkspaceArchive, parseWorkspaceArchive, MAX_ARCHIVE_BYTES} from "../services/workspaceArchive.js";
 
 const createChatValidator = (body) => ({
     value: {
@@ -102,9 +107,29 @@ const preferredModelValidator = (body) => {
     return {value: {model}};
 };
 
-export function createChatsRouter({repositories, chatService, modelService, config, chatRateLimiters}) {
+export function createChatsRouter({repositories, chatService, modelService, config, chatRateLimiters, attachmentService}) {
     const router = express.Router();
     router.use(requireLogin);
+    const receiveArchive = multer({storage: multer.memoryStorage(), limits: {fileSize: MAX_ARCHIVE_BYTES, files: 1, parts: 2}}).single("archive");
+    const readArchive = (req, res, next) => receiveArchive(req, res, error => {
+        if (error) return res.status(error.code === "LIMIT_FILE_SIZE" ? 413 : 400).json({error: "Invalid or oversized workspace archive"});
+        try {
+            if (!req.file) throw new Error("Choose a workspace archive");
+            req.archive = parseWorkspaceArchive(req.file.buffer);
+            next();
+        } catch (failure) { res.status(400).json({error: failure.message}); }
+    });
+    const archiveImages = (workspace, files) => {
+        const images = new Map();
+        for (const chat of workspace.chats) for (const message of chat.messages) for (const attachment of message.attachments) {
+            if (images.has(attachment.id)) continue;
+            const matches = [...files.entries()].filter(([name]) => name.startsWith(`images/${attachment.id}.`));
+            if (matches.length !== 1) throw new Error(`Image ${attachment.id} is missing from archive`);
+            const [name, buffer] = matches[0];
+            images.set(attachment.id, {buffer, size: buffer.length, originalname: name.split("/").at(-1)});
+        }
+        return images;
+    };
     router.use(["/chats/:id/messages/by-index/:index", "/chats/:id/messages/:messageId"], (req, res, next) => {
         const chatId = Number(req.params.id);
         const messageId = req.params.messageId ? Number(req.params.messageId) : chatService.getChatMessageByIndex(chatId, req.params.index)?.id;
@@ -141,14 +166,14 @@ export function createChatsRouter({repositories, chatService, modelService, conf
                 return res.json({chat, existing: Boolean(existingChat)});
             } catch (error) {
                 if (error.message === "CHAT_LIMIT_REACHED") {
-                    return res.status(400).json({error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`});
+                    return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`});
                 }
                 throw error;
             }
         }
 
         if (repositories.countChats(user) >= config.chatLimit) {
-            return res.status(400).json({error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`});
+            return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`});
         }
 
         return res.json({chat: repositories.createChat(user, title), existing: false});
@@ -168,6 +193,9 @@ export function createChatsRouter({repositories, chatService, modelService, conf
         const chatId = Number(req.params.id);
         const chat = repositories.getChat(chatId, req.session.user);
         if (!chat) return res.status(404).json({error: "Chat not found"});
+        if (chat.archived_at && !req.validatedBody.archived && repositories.countChats(req.session.user) >= config.chatLimit) {
+            return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive another chat before restoring this one.`});
+        }
         repositories.updateChatOrganization(chatId, req.session.user, {
             folderName: req.validatedBody.folderName,
             isPinned: req.validatedBody.isPinned,
@@ -599,6 +627,57 @@ export function createChatsRouter({repositories, chatService, modelService, conf
     });
 
     router.get("/exports/workspace", (req, res) => res.json({workspace: repositories.exportWorkspace(req.session.user)}));
+    router.get("/exports/workspace/archive", async (req, res) => {
+        try {
+            const workspace = repositories.exportWorkspace(req.session.user);
+            const images = new Map();
+            for (const chat of workspace.chats) for (const message of chat.messages) for (const attachment of message.attachments) {
+                if (images.has(attachment.id)) continue;
+                const row = attachmentService.owned(attachment.id, req.session.user);
+                images.set(attachment.id, [`images/${row.id}.${row.mime_type.split("/")[1]}`, await attachmentService.storage.read(row.storage_key)]);
+            }
+            const archive = createWorkspaceArchive(workspace, [...images.values()]);
+            res.set({"Content-Type": "application/gzip", "Content-Disposition": 'attachment; filename="workspace-backup.tar.gz"', "Cache-Control": "private, no-store"});
+            return res.send(archive);
+        } catch (error) {
+            return res.status(error.message.includes("250 MB") ? 413 : 500).json({error: "Workspace archive could not be created"});
+        }
+    });
+    router.post("/imports/workspace/archive/preview", readArchive, (req, res) => {
+        const validation = validateWorkspaceImport(req.archive.workspace, repositories.exportWorkspace(req.session.user));
+        if (validation.ok) {
+            try { archiveImages(validation.workspace, req.archive.images); }
+            catch (error) { validation.ok = false; validation.errors.push(error.message); }
+        }
+        return res.status(validation.ok ? 200 : 400).json({ok: validation.ok, errors: validation.errors, warnings: validation.warnings, preview: validation.preview});
+    });
+    router.post("/imports/workspace/archive", readArchive, async (req, res) => {
+        const validation = validateWorkspaceImport(req.archive.workspace, repositories.exportWorkspace(req.session.user));
+        if (!validation.ok) return res.status(400).json({error: "Workspace import validation failed", errors: validation.errors});
+        if (validation.preview.duplicates.length && req.body?.allowDuplicates !== "true") {
+            return res.status(409).json({error: "Workspace import contains duplicate records", warnings: validation.warnings, preview: validation.preview});
+        }
+        let images;
+        try { images = archiveImages(validation.workspace, req.archive.images); }
+        catch (error) { return res.status(400).json({error: error.message}); }
+        const restored = [];
+        try {
+            const ids = new Map();
+            for (const [oldId, file] of images) {
+                const uploaded = await attachmentService.upload(file, req.session.user, {forImport: true});
+                restored.push(uploaded.id);
+                ids.set(oldId, uploaded.id);
+            }
+            for (const chat of validation.workspace.chats) for (const message of chat.messages) {
+                message.attachments = message.attachments.map(attachment => ({id: ids.get(attachment.id)}));
+            }
+            const imported = repositories.importWorkspace(req.session.user, validation.workspace);
+            return res.json({imported, preview: validation.preview});
+        } catch (error) {
+            for (const id of restored) await attachmentService.remove(id, req.session.user).catch(() => {});
+            return res.status(error.status || 400).json({error: error.message || "Workspace archive import failed"});
+        }
+    });
     router.post("/imports/workspace/preview", (req, res) => {
         const validation = validateWorkspaceImport(req.body?.workspace, repositories.exportWorkspace(req.session.user));
         return res.status(validation.ok ? 200 : 400).json({
diff --git a/src/routes/pages.js b/src/routes/pages.js
index 519a6ad..7b2d19c 100644
--- a/src/routes/pages.js
+++ b/src/routes/pages.js
@@ -1,3 +1,6 @@
+/**
+ * @file Liefert öffentliche Seiten und geschützte Ansichten des Arbeitsbereichs aus.
+ */
 import express from "express";
 import {readFile} from "node:fs/promises";
 import {renderSiteHeader} from "../pageLayout.js";
diff --git a/src/routes/personas.js b/src/routes/personas.js
index f5681be..2238d42 100644
--- a/src/routes/personas.js
+++ b/src/routes/personas.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verwaltet eigene Personas sowie Veröffentlichung, Suche und Interaktionen auf dem Persona-Marktplatz.
+ */
 import express from "express";
 import {requireLogin} from "../middleware/auth.js";
 import {validateBody} from "../middleware/validate.js";
@@ -118,7 +121,7 @@ export function createPersonasRouter({repositories, chatService, modelService, c
             return res.json({chat: chatService.getOrCreatePersonaChat(user, persona, userPersonaId, null, null)});
         } catch (error) {
             if (error.message === "CHAT_LIMIT_REACHED") {
-                return res.status(400).json({error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`});
+                return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`});
             }
             throw error;
         }
@@ -242,7 +245,7 @@ export function createPersonasRouter({repositories, chatService, modelService, c
             chat = chatService.getOrCreatePersonaChat(user, persona, userPersonaId, scenarioPrompt, sceneSummary);
         } catch (error) {
             if (error.message === "CHAT_LIMIT_REACHED") {
-                return res.status(400).json({error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`});
+                return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`});
             }
             throw error;
         }
@@ -297,7 +300,7 @@ export function createPersonasRouter({repositories, chatService, modelService, c
             chat = chatService.getOrCreatePersonaChat(user, assistantPersona, userPersonaId, scenarioPrompt, sceneSummary);
         } catch (error) {
             if (error.message === "CHAT_LIMIT_REACHED") {
-                return res.status(400).json({error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`});
+                return res.status(400).json({error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`});
             }
             throw error;
         }
diff --git a/src/routes/settings.js b/src/routes/settings.js
index 3174ce1..81c2125 100644
--- a/src/routes/settings.js
+++ b/src/routes/settings.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verarbeitet Benutzer- und Kontoeinstellungen sowie Export und Import des Arbeitsbereichs.
+ */
 import express from "express";
 import bcrypt from "bcrypt";
 import {requireLogin} from "../middleware/auth.js";
diff --git a/src/routes/system.js b/src/routes/system.js
index 95148a8..bc16784 100644
--- a/src/routes/system.js
+++ b/src/routes/system.js
@@ -1,3 +1,6 @@
+/**
+ * @file Stellt Modellinformationen und administrative Diagnosedaten bereit.
+ */
 import express from "express";
 import {requireLogin} from "../middleware/auth.js";
 
diff --git a/src/routes/uploads.js b/src/routes/uploads.js
index c4a95c5..1dc3f62 100644
--- a/src/routes/uploads.js
+++ b/src/routes/uploads.js
@@ -1,3 +1,6 @@
+/**
+ * @file Verarbeitet das Hochladen, Abrufen und Entfernen von Bildanhängen mit Zugriffskontrolle.
+ */
 import express from "express";
 import multer from "multer";
 import {requireLogin} from "../middleware/auth.js";
diff --git a/src/routes/visionDebug.js b/src/routes/visionDebug.js
new file mode 100644
index 0000000..aa38ad3
--- /dev/null
+++ b/src/routes/visionDebug.js
@@ -0,0 +1,19 @@
+/**
+ * @file Liefert angemeldeten Benutzern die für sie zugänglichen Diagnosen der Bildverarbeitung.
+ */
+import express from "express";
+import {requireLogin} from "../middleware/auth.js";
+
+export function createVisionDebugRouter({visionDebugService, repositories}) {
+    const router = express.Router();
+    router.use(requireLogin);
+    router.get("/debug/vision/latest", (req, res) => {
+        const diagnostic = visionDebugService.latest(req.session.user, repositories);
+        return diagnostic ? res.json({diagnostic}) : res.status(404).json({error: "Vision diagnostic not found"});
+    });
+    router.get("/debug/vision/:requestId", (req, res) => {
+        const diagnostic = visionDebugService.get(req.params.requestId, req.session.user, repositories);
+        return diagnostic ? res.json({diagnostic}) : res.status(404).json({error: "Vision diagnostic not found"});
+    });
+    return router;
+}
diff --git a/src/services/attachmentService.js b/src/services/attachmentService.js
index 97a7f3b..17a0b04 100644
--- a/src/services/attachmentService.js
+++ b/src/services/attachmentService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Validiert und speichert Bildanhänge und bereitet zwischengespeicherte Bildanalysen für den Chat vor.
+ */
 import sharp from "sharp";
 import {createHash, randomUUID} from "node:crypto";
 import {attachmentMetadata} from "../db/attachments.js";
@@ -159,7 +162,7 @@ export function createAttachmentService(db, config, modelService, visionDebugSer
             db.prepare("DELETE FROM attachments WHERE id=?").run(id);
             return cleanup();
         },
-        async upload(file, user) {
+        async upload(file, user, {forImport = false} = {}) {
             await cleanup();
             if (!file?.buffer?.length) throw new AttachmentError("Choose a non-empty PNG, JPEG or WebP image");
             if (file.size > config.uploadMaxSizeMb * 1024 * 1024) throw new AttachmentError("Image is too large", 413);
@@ -175,9 +178,9 @@ export function createAttachmentService(db, config, modelService, visionDebugSer
             try {
                 // Bound abandoned uploads per account as well as per submitted message.
                 db.transaction(() => {
-                    if (db.prepare("SELECT COUNT(*) AS n FROM attachments WHERE username=? AND status='temporary'").get(user).n >= config.uploadMaxFiles * 4) throw new AttachmentError("Too many pending images. Remove unused uploads first.");
+                    if (!forImport && db.prepare("SELECT COUNT(*) AS n FROM attachments WHERE username=? AND status='temporary'").get(user).n >= config.uploadMaxFiles * 4) throw new AttachmentError("Too many pending images. Remove unused uploads first.");
                     db.prepare("INSERT INTO attachments(id,username,original_name,storage_key,mime_type,size_bytes,width,height) VALUES(?,?,?,?,?,?,?,?)").run(id, user,
-                        String(file.originalname || "image").replace(/[\\/\x00-\x1f]/g, "_").slice(0, 255), storageKey, `image/${info.format}`, file.size, info.width, info.height);
+                        [...String(file.originalname || "image").replace(/[\\/]/g, "_")].map(character => character.charCodeAt(0) < 32 ? "_" : character).join("").slice(0, 255), storageKey, `image/${info.format}`, file.size, info.width, info.height);
                 })();
             } catch (error) { await storage.delete(storageKey); throw error; }
             log("attachmentUploadSuccess", {id, size: file.size, mime: `image/${info.format}`});
diff --git a/src/services/chatMessageHelpers.js b/src/services/chatMessageHelpers.js
index fbecaa3..7c1feba 100644
--- a/src/services/chatMessageHelpers.js
+++ b/src/services/chatMessageHelpers.js
@@ -1,3 +1,6 @@
+/**
+ * @file Normalisiert Nachrichten und erstellt Kontexttexte für Erinnerungen, Zusammenfassungen und Personas.
+ */
 import {normalizeSources} from "./webSearchService.js";
 
 export function parseSources(value) {
diff --git a/src/services/chatService.js b/src/services/chatService.js
index 93f5ecb..73dbbc1 100644
--- a/src/services/chatService.js
+++ b/src/services/chatService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Koordiniert Chat-Antworten, Modellkontext, Websuche, Anhänge, Antwortvarianten und Gesprächsverzweigungen.
+ */
 import {
     buildPersonaPrompt,
     buildRoleplayDirectionPrompt,
@@ -95,15 +98,18 @@ export function createChatService(repositories, modelService, config, webSearchP
 
     const withChatGenerationLock = (chatId, operation) => {
         const previous = chatGenerationQueues.get(chatId) || Promise.resolve();
+        // Ein fehlgeschlagener Vorgänger darf die Warteschlange dieses Chats nicht blockieren.
         const current = previous.catch(() => undefined).then(operation);
         chatGenerationQueues.set(chatId, current);
         return current.finally(() => {
+            // Nur den eigenen Eintrag entfernen: Inzwischen könnte bereits ein Folgeauftrag warten.
             if (chatGenerationQueues.get(chatId) === current) chatGenerationQueues.delete(chatId);
         });
     };
 
     const withActiveGeneration = async (chatId, externalSignal, operation) => {
         const controller = new AbortController();
+        // Verbindungsabbruch und manuelles Stoppen wirken auf denselben Generierungsauftrag.
         const abortFromCaller = () => controller.abort(externalSignal?.reason);
         if (externalSignal?.aborted) abortFromCaller();
         else externalSignal?.addEventListener("abort", abortFromCaller, { once: true });
@@ -157,6 +163,7 @@ export function createChatService(repositories, modelService, config, webSearchP
         const allMessages = repositories.listActiveBranchMessages(chatId)
             .filter((message) => !message.delivery_status || message.delivery_status === "complete");
         const keepRecent = Math.max(0, config.chatHistoryLimit);
+        // Die neuesten Nachrichten bleiben vollständig im Kontext; nur ältere werden zusammengefasst.
         const cutoffIndex = allMessages.length - keepRecent - 1;
         if (cutoffIndex < 0) return;
         const cutoffMessage = allMessages[cutoffIndex];
@@ -577,7 +584,7 @@ export function createChatService(repositories, modelService, config, webSearchP
 
     const cloneChatThroughMessage = ({ user, sourceChat, messageId = null }) => {
         if (repositories.countChats(user) >= config.chatLimit) {
-            return { error: `Maximum of ${config.chatLimit} chats reached. Please delete an old chat to create a new one.`, status: 400 };
+            return { error: `Maximum of ${config.chatLimit} active chats reached. Archive or delete an active chat to create a new one.`, status: 400 };
         }
 
         const sourceMessages = messageId == null
diff --git a/src/services/localFileStorage.js b/src/services/localFileStorage.js
index 93ddaad..0a4df58 100644
--- a/src/services/localFileStorage.js
+++ b/src/services/localFileStorage.js
@@ -1,3 +1,6 @@
+/**
+ * @file Speichert, liest und löscht hochgeladene Dateien in einem lokalen Speicherverzeichnis.
+ */
 import fs from "node:fs";
 import path from "node:path";
 import {randomUUID} from "node:crypto";
diff --git a/src/services/modelService.js b/src/services/modelService.js
index a401aba..d170927 100644
--- a/src/services/modelService.js
+++ b/src/services/modelService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Kommuniziert mit Ollama und verwaltet Antwortstreams, Zeitlimits, Modellstatus und Modell-Caches.
+ */
 import { supportsReasoning } from "../../public/js/modelCapabilities.js";
 import { AttachmentError } from "./attachmentService.js";
 
@@ -147,6 +150,7 @@ export function createModelService(config, overrides = {}) {
                 touch();
                 buffer += decoder.decode(value, { stream: true });
                 const lines = buffer.split("\n");
+                // Netzwerkblöcke können mitten in einer JSON-Zeile enden; den Rest für den nächsten Block behalten.
                 buffer = lines.pop() || "";
                 for (const line of lines) {
                     const trimmed = line.trim();
@@ -160,6 +164,7 @@ export function createModelService(config, overrides = {}) {
             if (!completed && buffer.trim()) {
                 consume(buffer.trim());
             }
+            // Erst das Abschlussereignis bestätigt eine vollständige Antwort; ein Stream-Ende allein genügt nicht.
             if (!completed) throw new ModelServiceError("MODEL_INTERRUPTED", "Model response was interrupted.", 502);
             onRawReply?.(fullReply);
             return fullReply.trim();
diff --git a/src/services/personaService.js b/src/services/personaService.js
index 9236af4..a274e1c 100644
--- a/src/services/personaService.js
+++ b/src/services/personaService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Validiert Persona-Daten und erstellt Rollenspielanweisungen sowie Prüfungen für die Rollenverteilung.
+ */
 const PERSONA_FIELD_LIMITS = {
     name: 200,
     pronouns: 40,
diff --git a/src/services/visionAnalysis.js b/src/services/visionAnalysis.js
index 14a449b..4bfe5a0 100644
--- a/src/services/visionAnalysis.js
+++ b/src/services/visionAnalysis.js
@@ -1,3 +1,6 @@
+/**
+ * @file Definiert Anweisungen, Antwortschema und Normalisierung für Bildanalysen und deren Nutzung im Chat.
+ */
 // Bump whenever the perception prompt, schema, or interpretation contract changes.
 export const VISION_PROMPT_VERSION = 4;
 
diff --git a/src/services/visionDebugService.js b/src/services/visionDebugService.js
new file mode 100644
index 0000000..47df419
--- /dev/null
+++ b/src/services/visionDebugService.js
@@ -0,0 +1,183 @@
+/**
+ * @file Sammelt begrenzte Diagnosedaten zur Bildverarbeitung und kontrolliert deren benutzerbezogenen Zugriff.
+ */
+const RAW_VISION_LIMIT = 12000;
+const EVIDENCE_LIMIT = 100000;
+const ANSWER_LIMIT = 30000;
+const REASONING_LIMIT = 30000;
+const MAX_RECORDS = 100;
+const MAX_AGE_MS = 60 * 60 * 1000;
+
+const bounded = (value, limit) => typeof value === "string" ? value.slice(0, limit) : value;
+const clone = value => value == null ? value : structuredClone(value);
+const exposed = record => {
+    const value = clone(record);
+    delete value.user;
+    return value;
+};
+
+export function createVisionDebugService(config) {
+    const enabled = config.visionDebug === true;
+    const records = new Map();
+
+    const prune = () => {
+        const cutoff = Date.now() - MAX_AGE_MS;
+        for (const [id, record] of records) {
+            if (Date.parse(record.updatedAt) < cutoff) records.delete(id);
+        }
+        while (records.size > MAX_RECORDS) records.delete(records.keys().next().value);
+    };
+    const update = (requestId, operation) => {
+        if (!enabled || !requestId) return null;
+        const record = records.get(requestId);
+        if (!record) return null;
+        operation(record);
+        record.updatedAt = new Date().toISOString();
+        return record;
+    };
+    const image = (record, attachmentId) => record.images.find(item => item.attachmentId === attachmentId);
+
+    return {
+        enabled,
+        begin({requestId, user, chatId, triggeringMessageId, userQuestion, selectedModel, reasoningRequested, webSearchRequested}) {
+            if (!enabled || !requestId) return;
+            prune();
+            const timestamp = new Date().toISOString();
+            records.delete(requestId);
+            records.set(requestId, {
+                requestId, user, chatId, triggeringMessageId,
+                createdAt: timestamp, updatedAt: timestamp,
+                request: {userQuestion, selectedModel, reasoningRequested: reasoningRequested === true, webSearchRequested: webSearchRequested === true},
+                images: [],
+                qwen: null,
+                search: {
+                    requested: webSearchRequested === true,
+                    needed: null,
+                    explicitSearchIntent: null,
+                    state: webSearchRequested === true ? "pending" : "disabled",
+                    visualReference: "",
+                    queries: [],
+                    candidateCount: 0,
+                    selectedCount: 0,
+                    selectedSources: []
+                },
+                visibleReasoning: null,
+                finalAnswer: null,
+                error: null,
+                experimentNote: "For controlled Web Search/Reasoning comparisons, reuse this attachment and exact question. Re-uploading identical bytes creates a new attachment ID and vision cache entry."
+            });
+            prune();
+        },
+        recordImage(requestId, value) {
+            update(requestId, record => {
+                const existing = image(record, value.attachmentId);
+                const next = {
+                    requestId,
+                    chatId: record.chatId,
+                    triggeringMessageId: record.triggeringMessageId,
+                    attachmentId: value.attachmentId,
+                    sourceMessageId: value.sourceMessageId,
+                    position: value.position,
+                    scope: value.scope,
+                    label: value.label,
+                    originalFilename: value.originalFilename,
+                    mimeType: value.mimeType,
+                    width: value.width,
+                    height: value.height,
+                    sizeBytes: value.sizeBytes,
+                    imageSha256: null,
+                    visionModel: value.visionModel,
+                    visionPromptVersion: value.visionPromptVersion,
+                    normalizedQuestion: value.normalizedQuestion,
+                    cacheHit: null,
+                    cacheIdentity: null,
+                    rawVisionResponse: null,
+                    normalizedVisionAnalysis: null
+                };
+                if (existing) Object.assign(existing, next); else record.images.push(next);
+            });
+        },
+        recordCache(requestId, attachmentId, {cacheHit, cacheIdentity, normalizedVisionAnalysis}) {
+            update(requestId, record => {
+                const entry = image(record, attachmentId);
+                if (!entry) return;
+                entry.cacheHit = cacheHit === true;
+                entry.cacheIdentity = clone(cacheIdentity);
+                entry.rawVisionResponse = null;
+                if (normalizedVisionAnalysis !== undefined) entry.normalizedVisionAnalysis = clone(normalizedVisionAnalysis);
+            });
+        },
+        recordVisionRun(requestId, attachmentId, {imageSha256, rawVisionResponse, normalizedVisionAnalysis}) {
+            update(requestId, record => {
+                const entry = image(record, attachmentId);
+                if (!entry) return;
+                entry.cacheHit = false;
+                entry.imageSha256 = imageSha256 || null;
+                entry.rawVisionResponse = bounded(String(rawVisionResponse ?? ""), RAW_VISION_LIMIT);
+                entry.normalizedVisionAnalysis = clone(normalizedVisionAnalysis);
+            });
+        },
+        recordQwen(requestId, value) {
+            update(requestId, record => {
+                record.qwen = {
+                    imageEvidence: bounded(value.imageEvidence, EVIDENCE_LIMIT),
+                    visionGuidanceSha256: value.visionGuidanceSha256,
+                    visionEvidenceIncluded: value.visionEvidenceIncluded === true,
+                    imageCount: value.imageCount,
+                    currentImageLabels: clone(value.currentImageLabels),
+                    model: value.model,
+                    think: value.think === true,
+                    stream: value.stream === true,
+                    temperature: value.temperature ?? null,
+                    numCtx: value.numCtx ?? null,
+                    numPredict: value.numPredict ?? null,
+                    keepAlive: value.keepAlive
+                };
+            });
+        },
+        recordSearch(requestId, value) {
+            update(requestId, record => {
+                record.search = {
+                    ...record.search,
+                    requested: value.requested === true,
+                    needed: value.needed ?? record.search.needed,
+                    explicitSearchIntent: value.explicitSearchIntent ?? record.search.explicitSearchIntent,
+                    state: value.state ?? record.search.state,
+                    visualReference: bounded(value.visualReference ?? record.search.visualReference, 1200),
+                    queries: Array.isArray(value.queries) ? value.queries.map(item => bounded(String(item), 500)) : record.search.queries,
+                    candidateCount: value.candidateCount ?? record.search.candidateCount,
+                    selectedCount: value.selectedCount ?? record.search.selectedCount,
+                    selectedSources: Array.isArray(value.selectedSources) ? value.selectedSources.slice(0, 5).map((source, index) => ({
+                        index: index + 1,
+                        title: bounded(String(source.title || ""), 300),
+                        url: bounded(String(source.url || ""), 2048),
+                        snippet: bounded(String(source.snippet || ""), 500)
+                    })) : record.search.selectedSources
+                };
+            });
+        },
+        complete(requestId, {finalAnswer, visibleReasoning}) {
+            update(requestId, record => {
+                record.finalAnswer = bounded(String(finalAnswer ?? ""), ANSWER_LIMIT);
+                record.visibleReasoning = visibleReasoning ? bounded(String(visibleReasoning), REASONING_LIMIT) : null;
+            });
+        },
+        fail(requestId, error) {
+            update(requestId, record => { record.error = bounded(String(error?.message || error || "Request failed"), 1000); });
+        },
+        get(requestId, user, repositories) {
+            if (!enabled) return null;
+            prune();
+            const record = records.get(requestId);
+            if (!record || record.user !== user || !repositories.getChat(record.chatId, user)) return null;
+            return exposed(record);
+        },
+        latest(user, repositories) {
+            if (!enabled) return null;
+            prune();
+            const values = [...records.values()].reverse();
+            const record = values.find(item => item.user === user && repositories.getChat(item.chatId, user));
+            return record ? exposed(record) : null;
+        }
+    };
+}
diff --git a/src/services/webSearchService.js b/src/services/webSearchService.js
index a715c6a..48d3061 100644
--- a/src/services/webSearchService.js
+++ b/src/services/webSearchService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Entscheidet über Websuchen, fragt SearXNG ab und bereitet relevante Quellen als Modellkontext auf.
+ */
 /** @typedef {{title: string, url: string, snippet: string, score?: number, engine?: string, category?: string, publishedDate?: string}} RawSearchResult */
 /** @typedef {{title: string, url: string, snippet: string}} SearchResult */
 /** @typedef {{signal?: AbortSignal, limit?: number, category?: string}} SearchOptions */
diff --git a/src/services/workspaceArchive.js b/src/services/workspaceArchive.js
new file mode 100644
index 0000000..4c12099
--- /dev/null
+++ b/src/services/workspaceArchive.js
@@ -0,0 +1,61 @@
+/** Portable workspace archive: a gzip-compressed ustar file with JSON and images. */
+import {gzipSync, gunzipSync} from "node:zlib";
+
+export const MAX_ARCHIVE_BYTES = 250 * 1024 * 1024;
+
+function header(name, size) {
+    const block = Buffer.alloc(512);
+    block.write(name, 0, 100, "ascii");
+    block.write("0000644\0", 100, "ascii");
+    block.write("0000000\0", 108, "ascii");
+    block.write("0000000\0", 116, "ascii");
+    block.write(size.toString(8).padStart(11, "0") + "\0", 124, "ascii");
+    block.write(Math.floor(Date.now() / 1000).toString(8).padStart(11, "0") + "\0", 136, "ascii");
+    block.fill(32, 148, 156);
+    block.write("0", 156, "ascii");
+    block.write("ustar\0", 257, "ascii");
+    block.write("00", 263, "ascii");
+    const checksum = block.reduce((sum, byte) => sum + byte, 0);
+    block.write(checksum.toString(8).padStart(6, "0") + "\0 ", 148, "ascii");
+    return block;
+}
+
+export function createWorkspaceArchive(workspace, images) {
+    const files = [["workspace.json", Buffer.from(JSON.stringify(workspace, null, 2))], ...images];
+    const chunks = [];
+    let total = 1024;
+    for (const [name, body] of files) {
+        if (!/^(workspace\.json|images\/[a-f0-9-]{36}\.(png|jpeg|webp))$/.test(name)) throw new Error("Invalid archive entry");
+        total += 512 + Math.ceil(body.length / 512) * 512;
+        if (total > MAX_ARCHIVE_BYTES) throw new Error("Workspace archive exceeds 250 MB");
+        chunks.push(header(name, body.length), body, Buffer.alloc((512 - body.length % 512) % 512));
+    }
+    chunks.push(Buffer.alloc(1024));
+    return gzipSync(Buffer.concat(chunks, total), {level: 1});
+}
+
+export function parseWorkspaceArchive(buffer) {
+    if (!Buffer.isBuffer(buffer) || buffer.length > MAX_ARCHIVE_BYTES) throw new Error("Archive exceeds 250 MB");
+    const tar = gunzipSync(buffer, {maxOutputLength: MAX_ARCHIVE_BYTES});
+    const files = new Map();
+    for (let offset = 0; offset + 512 <= tar.length;) {
+        const block = tar.subarray(offset, offset + 512);
+        if (block.every(byte => byte === 0)) break;
+        const name = block.toString("ascii", 0, 100).split("\0")[0];
+        if (!/^(workspace\.json|images\/[a-f0-9-]{36}\.(png|jpeg|webp))$/.test(name) || files.has(name) || block.toString("ascii", 156, 157) !== "0") {
+            throw new Error("Invalid archive entry");
+        }
+        const recorded = Number.parseInt(block.toString("ascii", 148, 156).trim(), 8);
+        const copy = Buffer.from(block); copy.fill(32, 148, 156);
+        if (recorded !== copy.reduce((sum, byte) => sum + byte, 0)) throw new Error("Invalid archive checksum");
+        const size = Number.parseInt(block.toString("ascii", 124, 136).replaceAll("\0", "").trim(), 8);
+        if (!Number.isSafeInteger(size) || size < 0 || offset + 512 + size > tar.length) throw new Error("Invalid archive size");
+        files.set(name, tar.subarray(offset + 512, offset + 512 + size));
+        offset += 512 + Math.ceil(size / 512) * 512;
+    }
+    if (!files.has("workspace.json")) throw new Error("Archive has no workspace.json");
+    let workspace;
+    try { workspace = JSON.parse(files.get("workspace.json").toString("utf8")); }
+    catch { throw new Error("Archive has invalid workspace.json"); }
+    return {workspace, images: files};
+}
diff --git a/src/services/workspaceImportService.js b/src/services/workspaceImportService.js
index 442f6b8..7ad9171 100644
--- a/src/services/workspaceImportService.js
+++ b/src/services/workspaceImportService.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft und normalisiert importierte Arbeitsbereiche mit Personas, Chats und Nachrichtenbeziehungen.
+ */
 import {parseSources} from "./chatMessageHelpers.js";
 
 const VALID_PERSONA_TYPES = new Set(["assistant", "user"]);
diff --git a/test/app.test.js b/test/app.test.js
index 62241f4..27cb379 100644
--- a/test/app.test.js
+++ b/test/app.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Anmeldung, Kontoverwaltung, Chats, Personas und den Server-Lebenszyklus der Anwendung.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import fs from "fs";
@@ -249,6 +252,48 @@ test("account export, logout-all, and deletion controls work", async () => {
     await server.close();
 });
 
+test("username and password changes keep account data and sessions consistent", async t => {
+    const server = await startTestServer();
+    t.after(() => server.close());
+    const jar = new CookieJar();
+    const otherSession = new CookieJar();
+    await request(server.baseUrl, "/register", {method: "POST", body: {username: "accountowner", password: "old-password"}});
+    await request(server.baseUrl, "/register", {method: "POST", body: {username: "alreadytaken", password: "password123"}});
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "accountowner", password: "old-password"}, jar})).status, 200);
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "accountowner", password: "old-password"}, jar: otherSession})).status, 200);
+    const chat = await request(server.baseUrl, "/chats", {method: "POST", body: {title: "Keep this chat"}, jar});
+    assert.equal(chat.status, 200);
+    const persona = await request(server.baseUrl, "/personas", {method: "POST", body: {name: "Keeper", personaType: "user"}, jar});
+    assert.equal(persona.status, 200);
+    const db = server.app.locals.db;
+    const attachmentId = "12345678-1234-1234-1234-123456789abc";
+    db.prepare("INSERT INTO attachments (id, username, original_name, storage_key, mime_type, size_bytes, width, height) VALUES (?, ?, ?, ?, ?, ?, ?, ?)")
+        .run(attachmentId, "accountowner", "picture.png", "rename-test-image", "image/png", 1, 1, 1);
+
+    assert.equal((await request(server.baseUrl, "/settings/username", {method: "PUT", body: {username: "newowner", password: "wrong"}, jar})).status, 403);
+    assert.equal((await request(server.baseUrl, "/settings/username", {method: "PUT", body: {username: "alreadytaken", password: "old-password"}, jar})).status, 400);
+    const renamed = await request(server.baseUrl, "/settings/username", {method: "PUT", body: {username: "newowner", password: "old-password"}, jar});
+    assert.equal(renamed.status, 200);
+    assert.equal(renamed.json.username, "newowner");
+    assert.equal((await request(server.baseUrl, "/settings/profile", {jar})).json.username, "newowner");
+    assert.equal((await request(server.baseUrl, "/session", {jar})).json.user, "newowner");
+    assert.equal((await request(server.baseUrl, "/session", {jar: otherSession})).json.user, null);
+    assert.equal((await request(server.baseUrl, "/chats", {jar})).json.chats[0].id, chat.json.chat.id);
+    assert.equal((await request(server.baseUrl, "/personas", {jar})).json.userPersonas[0].id, persona.json.persona.id);
+    assert.equal(db.prepare("SELECT username FROM attachments WHERE id = ?").get(attachmentId).username, "newowner");
+    assert.deepEqual(db.pragma("foreign_key_check"), []);
+
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "newowner", password: "old-password"}, jar: otherSession})).status, 200);
+    assert.equal((await request(server.baseUrl, "/settings/password", {method: "PUT", body: {currentPassword: "wrong", newPassword: "new-password"}, jar})).status, 403);
+    assert.equal((await request(server.baseUrl, "/settings/password", {method: "PUT", body: {currentPassword: "old-password", newPassword: "new-password"}, jar})).status, 200);
+    assert.equal((await request(server.baseUrl, "/settings/profile", {jar})).status, 200);
+    assert.equal((await request(server.baseUrl, "/session", {jar: otherSession})).json.user, null);
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "newowner", password: "old-password"}})).status, 403);
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "newowner", password: "new-password"}})).status, 200);
+    assert.equal((await request(server.baseUrl, "/login", {method: "POST", body: {username: "accountowner", password: "new-password"}})).status, 400);
+    assert.equal((await request(server.baseUrl, "/settings/export", {jar})).json.account.username, "newowner");
+});
+
 test("admin diagnostics require admin and return model status", async () => {
     const server = await startTestServer({
         config: {
@@ -769,9 +814,18 @@ test("chat search, organization, and workspace export work", async () => {
         jar
     });
 
+    await request(server.baseUrl, "/chat", {
+        method: "POST",
+        body: {chatId, message: "another keyword passage", model: "mistral:latest"},
+        jar
+    });
+
     const search = await request(server.baseUrl, "/chats/search?q=keyword", {jar});
     assert.equal(search.status, 200);
     assert.equal(search.json.chats.length, 1);
+    assert.equal(search.json.chats[0].matched_content, "another keyword passage");
+    const messages = await request(server.baseUrl, `/chats/${chatId}/messages`, {jar});
+    assert.equal(search.json.chats[0].matched_message_id, messages.json.messages.find(message => message.content === "another keyword passage").id);
 
     const organize = await request(server.baseUrl, `/chats/${chatId}/organization`, {
         method: "PUT",
@@ -833,6 +887,30 @@ test("chat search, organization, and workspace export work", async () => {
     await server.close();
 });
 
+test("archiving frees an active chat slot and restoring respects the limit", async () => {
+    const server = await startTestServer({config: {chatLimit: 1}});
+    try {
+        const jar = new CookieJar();
+        await request(server.baseUrl, "/register", {method: "POST", body: {username: "archiver", password: "password123"}});
+        await request(server.baseUrl, "/login", {method: "POST", body: {username: "archiver", password: "password123"}, jar});
+        const first = await request(server.baseUrl, "/chats", {method: "POST", body: {title: "First"}, jar});
+        assert.equal(first.status, 200);
+        assert.equal((await request(server.baseUrl, "/chats", {method: "POST", body: {title: "Blocked"}, jar})).status, 400);
+        assert.equal((await request(server.baseUrl, `/chats/${first.json.chat.id}/organization`, {
+            method: "PUT", body: {archived: true}, jar
+        })).status, 200);
+        const second = await request(server.baseUrl, "/chats", {method: "POST", body: {title: "Second"}, jar});
+        assert.equal(second.status, 200);
+        assert.equal((await request(server.baseUrl, `/chats/${first.json.chat.id}/organization`, {
+            method: "PUT", body: {archived: false}, jar
+        })).status, 400);
+        await request(server.baseUrl, `/chats/${second.json.chat.id}/organization`, {method: "PUT", body: {archived: true}, jar});
+        assert.equal((await request(server.baseUrl, `/chats/${first.json.chat.id}/organization`, {
+            method: "PUT", body: {archived: false}, jar
+        })).status, 200);
+    } finally { await server.close(); }
+});
+
 test("persona clone, version restore, and market feedback endpoints work", async () => {
     const server = await startTestServer();
     const jar = new CookieJar();
diff --git a/test/attachmentComposer.test.js b/test/attachmentComposer.test.js
index aec79de..eadf598 100644
--- a/test/attachmentComposer.test.js
+++ b/test/attachmentComposer.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Anhangsvorschauen, Upload-Zustände, Wiederholungen und das Verwerfen von Entwürfen.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import { appendAttachments, createAttachmentComposer } from "../public/js/attachments.js";
@@ -94,3 +97,32 @@ test("discarding a chat draft aborts upload, deletes temporary files, and serial
     composer.clear();
     assert.deepEqual(deletes, [`/attachments/${temporaryId}`], "Sent attachments are retained");
 });
+
+test("attachments stay with their chat while uploads finish after switching", async t => {
+    const originalDocument = globalThis.document, originalFetch = globalThis.fetch;
+    t.after(() => { globalThis.document = originalDocument; globalThis.fetch = originalFetch; });
+    const elements = Object.fromEntries(["attachImage", "imagePicker", "uploadPreviews", "composer"].map(id => [id, new Element()]));
+    globalThis.document = {getElementById: id => elements[id], querySelector: () => elements.composer, createElement: () => new Element()};
+    let completeUpload;
+    const deletes = [];
+    globalThis.fetch = (url) => {
+        if (url === "/uploads/config") return Promise.resolve(Response.json({maxFiles: 5, maxSizeMb: 10}));
+        if (url === "/uploads") return new Promise(resolve => { completeUpload = resolve; });
+        deletes.push(url);
+        return Promise.resolve(Response.json({success: true}));
+    };
+    const composer = createAttachmentComposer({onChange() {}, onError: message => assert.fail(message)});
+    elements.imagePicker.files = [new File(["fixture"], "draft.png", {type: "image/png"})];
+    elements.imagePicker.onchange();
+    composer.saveDraft(1);
+    composer.restoreDraft(2);
+    assert.equal(composer.attachments.length, 0);
+    const metadata = {id: "12345678-1234-1234-1234-123456789abc"};
+    completeUpload(Response.json(metadata));
+    await new Promise(resolve => setTimeout(resolve, 0));
+    assert.deepEqual(deletes, []);
+    composer.saveDraft(2);
+    composer.restoreDraft(1);
+    assert.deepEqual(composer.attachments, [metadata]);
+    composer.discard();
+});
diff --git a/test/attachments.test.js b/test/attachments.test.js
index 0675cb2..90aa829 100644
--- a/test/attachments.test.js
+++ b/test/attachments.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Uploads, Zugriffsrechte und den Lebenszyklus von Bildanhängen sowie ihre Nutzung im Modellkontext.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import fs from "node:fs/promises";
@@ -129,6 +132,37 @@ test("account rename retains ownership and account deletion removes pending file
     await assert.rejects(fs.access(path.join(s.directory, key)));
 });
 
+test("workspace archive restores image bytes for another account", async t => {
+    const s = await setup(t);
+    const bytes = await s.image("png");
+    const image = await (await s.upload(bytes)).json();
+    const chatId = await s.chat();
+    assert.equal((await s.api("/chat", {chatId, message: "What is in this image?", attachments: [image.id]})).status, 200);
+    const exported = await s.api("/exports/workspace/archive");
+    assert.equal(exported.status, 200);
+    assert.match(exported.headers.get("content-disposition"), /workspace-backup\.tar\.gz/);
+    const archive = await exported.blob();
+    const destination = await s.register("destination");
+    const form = () => {
+        const data = new FormData();
+        data.append("archive", archive, "workspace.tar.gz");
+        return data;
+    };
+    const base = new URL("/", exported.url).origin;
+    const preview = await fetch(base + "/imports/workspace/archive/preview", {method: "POST", headers: {Cookie: destination}, body: form()});
+    assert.equal(preview.status, 200);
+    assert.equal((await preview.json()).preview.chats, 1);
+    const imported = await fetch(base + "/imports/workspace/archive", {method: "POST", headers: {Cookie: destination}, body: form()});
+    assert.equal(imported.status, 200);
+    const workspace = await (await s.api("/exports/workspace", null, "GET", destination)).json();
+    const restored = workspace.workspace.chats[0].messages[0].attachments[0];
+    assert.notEqual(restored.id, image.id);
+    const download = await s.api(`/attachments/${restored.id}`, null, "GET", destination);
+    assert.equal(download.status, 200);
+    assert.deepEqual(Buffer.from(await download.arrayBuffer()), bytes);
+    assert.equal((await s.api(`/attachments/${restored.id}`)).status, 404);
+});
+
 test("images feed dedicated vision, cache, streamed reasoning, reload and shared branch lifecycle", async t => {
     const s = await setup(t);
     const uploads = [];
diff --git a/test/config.test.js b/test/config.test.js
index 27def09..a06da3b 100644
--- a/test/config.test.js
+++ b/test/config.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Konfigurationsvorgaben und Sicherheitsanforderungen für Test- und Produktionsbetrieb.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import {createConfig} from "../src/config.js";
diff --git a/test/modelStreaming.test.js b/test/modelStreaming.test.js
index 7ec807c..dd7ae20 100644
--- a/test/modelStreaming.test.js
+++ b/test/modelStreaming.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Antwortstreaming, Zeitlimits, Protokollfehler und Abbrüche bei getrennten Verbindungen.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import { createServer } from "node:http";
diff --git a/test/reasoning.test.js b/test/reasoning.test.js
index eb531d6..3664ba0 100644
--- a/test/reasoning.test.js
+++ b/test/reasoning.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Reasoning-Auswahl, getrennte Gedankenstreams und deren Speicherung sowie Darstellung.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import { createServer } from "node:http";
diff --git a/test/regeneration.test.js b/test/regeneration.test.js
index 30a17e8..bec52c1 100644
--- a/test/regeneration.test.js
+++ b/test/regeneration.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Antwortvarianten und den Erhalt bestehender Antworten bei fehlgeschlagener Neugenerierung.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import {createServer} from "node:http";
diff --git a/test/regenerationUi.test.js b/test/regenerationUi.test.js
index 3895d57..bfeb3df 100644
--- a/test/regenerationUi.test.js
+++ b/test/regenerationUi.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft die Neugenerierung innerhalb einer Nachrichtenkarte mit Scrollverhalten und Wiederherstellung.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import {readFile} from "node:fs/promises";
diff --git a/test/visionAnalysis.test.js b/test/visionAnalysis.test.js
index 2c5da16..404b7e7 100644
--- a/test/visionAnalysis.test.js
+++ b/test/visionAnalysis.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Schema, Anweisungen, Normalisierung und Fehlerbehandlung der Bildanalyse.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import {parseVisionAnalysis} from "../src/services/attachmentService.js";
diff --git a/test/visionDiagnostics.test.js b/test/visionDiagnostics.test.js
new file mode 100644
index 0000000..bdbf5c0
--- /dev/null
+++ b/test/visionDiagnostics.test.js
@@ -0,0 +1,209 @@
+/**
+ * @file Prüft Zugriffsschutz und Diagnoseaufzeichnungen für Bildanalysen, Caches und Modellanfragen.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import {createServer} from "node:http";
+import sharp from "sharp";
+import {createApp} from "../src/app.js";
+import {VISION_PROMPT_VERSION} from "../src/services/visionAnalysis.js";
+
+async function listen(t, handler) {
+    const server = createServer(handler);
+    await new Promise(resolve => server.listen(0, "127.0.0.1", resolve));
+    t.after(() => new Promise(resolve => { server.closeAllConnections(); server.close(resolve); }));
+    return {server, url: `http://127.0.0.1:${server.address().port}`};
+}
+
+async function setup(t, visionDebug = true) {
+    const directory = await fs.mkdtemp(path.join(os.tmpdir(), "elsewhere-vision-debug-"));
+    const requests = [];
+    const searchQueries = [];
+    const rawVisionResponse = ` \n${JSON.stringify({
+        scene: "A penguin stands on dark rocks.",
+        subjects: [{type: "bird", description: "Black crown and white throat", location: "center"}],
+        visualDetails: ["A thin black line runs directly beneath the chin."],
+        visibleText: [], spatialRelationships: [], colorsAndAppearance: ["black and white plumage"],
+        recognizedElements: ["penguin"], notableFeatures: ["thin black line beneath chin"], uncertainties: []
+    })}\n `;
+    const search = await listen(t, (req, res) => {
+        searchQueries.push(new URL(req.url, "http://localhost").searchParams.get("q"));
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({results: [{title: "Penguin identification guide", url: "https://example.com/penguins",
+            content: "A penguin identification guide compares crown, throat, bill, and chin markings."}]}));
+    });
+    const app = createApp({config: {
+        dbPath: ":memory:", uploadDir: directory, testMode: true, sessionSecret: "vision-debug-tests",
+        visionDebug, visionModel: "qwen2.5vl:7b", chatSummaryUpdateEveryMessages: 0,
+        searxngUrl: search.url, eventLoopLagMonitorEnabled: false,
+        slowRequestLoggingEnabled: false, structuredRequestLoggingEnabled: false
+    }, modelOverrides: {fetch: async (_url, options) => {
+        const body = JSON.parse(options.body);
+        requests.push(body);
+        const chunks = body.model === "qwen2.5vl:7b"
+            ? [{message: {content: rawVisionResponse}, done: true}]
+            : [...(body.think ? [{message: {thinking: "Compare the supplied visible evidence."}}] : []),
+                {message: {content: "Final penguin answer."}, done: true}];
+        return new Response(chunks.map(chunk => JSON.stringify(chunk)).join("\n"));
+    }}});
+    const backend = await listen(t, app);
+    t.after(async () => { await app.locals.close(); await fs.rm(directory, {recursive: true, force: true}); });
+    const register = async username => {
+        const response = await fetch(backend.url + "/register", {method: "POST", headers: {"Content-Type": "application/json"},
+            body: JSON.stringify({username, password: "test-password"})});
+        assert.equal(response.status, 200);
+        return response.headers.get("set-cookie").split(";")[0];
+    };
+    const request = (url, {cookie = "", method = "GET", body, headers = {}} = {}) => fetch(backend.url + url, {
+        method, headers: {...headers, ...(cookie ? {Cookie: cookie} : {}), ...(body ? {"Content-Type": "application/json"} : {})},
+        body: body ? JSON.stringify(body) : undefined
+    });
+    const upload = async (cookie, bytes, filename = "penguin.png") => {
+        const form = new FormData();
+        form.append("image", new Blob([bytes], {type: "image/png"}), filename);
+        const response = await fetch(backend.url + "/uploads", {method: "POST", headers: {Cookie: cookie}, body: form});
+        assert.equal(response.status, 201);
+        return response.json();
+    };
+    const createChat = async cookie => {
+        const response = await request("/chats", {cookie, method: "POST", body: {title: "Vision debug"}});
+        return (await response.json()).chat.id;
+    };
+    return {app, backend, register, request, upload, createChat, requests, searchQueries, rawVisionResponse};
+}
+
+const getDiagnostic = async (s, cookie, requestId) => {
+    const response = await s.request(`/debug/vision/${requestId}`, {cookie});
+    assert.equal(response.status, 200);
+    return (await response.json()).diagnostic;
+};
+
+test("vision diagnostics routes are absent when disabled and protected when enabled", async t => {
+    const disabled = await setup(t, false);
+    assert.equal(disabled.app.locals.config.visionDebug, false);
+    const disabledUser = await disabled.register("debug-disabled");
+    assert.equal((await disabled.request("/debug/vision/latest", {cookie: disabledUser})).status, 404);
+
+    const enabled = await setup(t, true);
+    assert.equal((await enabled.request("/debug/vision/latest")).status, 403);
+});
+
+test("vision diagnostics capture misses, hits, Qwen evidence, search, reasoning and ownership safely", async t => {
+    const s = await setup(t, true);
+    const owner = await s.register("debug-owner");
+    const other = await s.register("debug-other");
+    const chatId = await s.createChat(owner);
+    const bytes = await sharp({create: {width: 24, height: 12, channels: 3, background: "black"}}).png().toBuffer();
+    const attachment = await s.upload(owner, bytes);
+    const question = "Search the web to identify this penguin.";
+
+    const first = await s.request("/chat", {cookie: owner, method: "POST", body: {
+        chatId, message: question, attachments: [attachment.id], model: "qwen3:14b", webSearch: false, reasoning: false
+    }});
+    assert.equal(first.status, 200);
+    const firstRequestId = first.headers.get("x-request-id");
+    const miss = await getDiagnostic(s, owner, firstRequestId);
+    assert.equal((await s.request(`/debug/vision/${firstRequestId}`, {cookie: other})).status, 404);
+    assert.equal(miss.requestId, firstRequestId);
+    assert.equal(miss.chatId, chatId);
+    assert.equal(miss.user, undefined);
+    assert.equal(miss.images.length, 1);
+    const image = miss.images[0];
+    assert.equal(image.attachmentId, attachment.id);
+    assert.equal(image.position, 0);
+    assert.equal(image.scope, "current");
+    assert.equal(image.label, "Current image 1");
+    assert.equal(image.originalFilename, "penguin.png");
+    assert.equal(image.mimeType, "image/png");
+    assert.equal(image.width, 24); assert.equal(image.height, 12); assert.equal(image.sizeBytes, bytes.length);
+    assert.equal(image.visionModel, "qwen2.5vl:7b");
+    assert.equal(image.visionPromptVersion, VISION_PROMPT_VERSION);
+    assert.equal(image.normalizedQuestion, question);
+    assert.equal(image.cacheHit, false);
+    assert.match(image.imageSha256, /^[a-f0-9]{64}$/);
+    assert.equal(image.rawVisionResponse, s.rawVisionResponse);
+    assert.equal(image.normalizedVisionAnalysis.scene, "A penguin stands on dark rocks.");
+    assert.equal(miss.qwen.visionEvidenceIncluded, true);
+    assert.equal(miss.qwen.imageCount, 1);
+    assert.deepEqual(miss.qwen.currentImageLabels, ["Current image 1"]);
+    assert.equal(miss.qwen.model, "qwen3:14b");
+    assert.equal(miss.qwen.think, false);
+    assert.equal(miss.qwen.stream, true);
+    assert.equal(miss.qwen.keepAlive, "30m");
+    const finalRequest = s.requests.findLast(request => request.model === "qwen3:14b");
+    assert.equal(miss.qwen.imageEvidence, finalRequest.messages.find(message => message.content.startsWith("<image_evidence>")).content);
+    assert.match(miss.qwen.visionGuidanceSha256, /^[a-f0-9]{64}$/);
+    assert.equal(miss.search.state, "disabled");
+    assert.equal(miss.visibleReasoning, null);
+    assert.equal(miss.finalAnswer, "Final penguin answer.");
+    const uploadedBase64 = s.requests.find(request => request.model === "qwen2.5vl:7b").messages.at(-1).images[0];
+    const diagnosticText = JSON.stringify(miss);
+    assert.equal(diagnosticText.includes(uploadedBase64), false);
+    assert.equal(diagnosticText.includes(bytes.toString("latin1")), false);
+
+    const messagesResponse = await s.request(`/chats/${chatId}/messages`, {cookie: owner});
+    const bot = (await messagesResponse.json()).messages.at(-1);
+    const retry = await s.request(`/chats/${chatId}/messages/${bot.id}/retry`, {cookie: owner, method: "POST", body: {
+        model: "qwen3:14b", webSearch: true, reasoning: true
+    }});
+    assert.equal(retry.status, 200);
+    const hit = await getDiagnostic(s, owner, retry.headers.get("x-request-id"));
+    assert.equal(hit.images[0].cacheHit, true);
+    assert.deepEqual(hit.images[0].cacheIdentity, {attachmentId: attachment.id, visionModel: "qwen2.5vl:7b",
+        visionPromptVersion: VISION_PROMPT_VERSION, normalizedQuestion: question});
+    assert.equal(hit.images[0].rawVisionResponse, null);
+    assert.equal(hit.images[0].imageSha256, null);
+    assert.deepEqual(hit.images[0].normalizedVisionAnalysis, image.normalizedVisionAnalysis);
+    assert.equal(hit.qwen.imageEvidence, miss.qwen.imageEvidence);
+    assert.equal(hit.qwen.think, true);
+    assert.equal(hit.visibleReasoning, "Compare the supplied visible evidence.");
+    assert.equal(hit.search.requested, true);
+    assert.equal(hit.search.needed, true);
+    assert.equal(hit.search.explicitSearchIntent, true);
+    assert.equal(hit.search.state, "succeeded");
+    assert.match(hit.search.visualReference, /thin black line beneath chin/i);
+    assert.deepEqual(hit.search.queries, s.searchQueries);
+    assert.equal(hit.search.candidateCount, 1);
+    assert.equal(hit.search.selectedCount, 1);
+    assert.deepEqual(hit.search.selectedSources[0], {index: 1, title: "Penguin identification guide",
+        url: "https://example.com/penguins", snippet: "A penguin identification guide compares crown, throat, bill, and chin markings."});
+    assert.equal(hit.finalAnswer, "Final penguin answer.");
+    const latest = await s.request("/debug/vision/latest", {cookie: owner});
+    assert.equal((await latest.json()).diagnostic.requestId, hit.requestId);
+});
+
+test("diagnostics distinguish skipped search and preserve multiple and historical image provenance", async t => {
+    const s = await setup(t, true);
+    const cookie = await s.register("debug-provenance");
+    const chatId = await s.createChat(cookie);
+    const red = await sharp({create: {width: 20, height: 10, channels: 3, background: "red"}}).png().toBuffer();
+    const blue = await sharp({create: {width: 30, height: 15, channels: 3, background: "blue"}}).png().toBuffer();
+    const first = await s.upload(cookie, red, "first.png");
+    const second = await s.upload(cookie, blue, "second.png");
+    const comparison = await s.request("/chat", {cookie, method: "POST", body: {
+        chatId, message: "What species are these?", attachments: [first.id, second.id], webSearch: true
+    }});
+    const current = await getDiagnostic(s, cookie, comparison.headers.get("x-request-id"));
+    assert.deepEqual(current.images.map(image => [image.attachmentId, image.position, image.scope, image.label]), [
+        [first.id, 0, "current", "Current image 1"], [second.id, 1, "current", "Current image 2"]
+    ]);
+    assert.notEqual(current.images[0].imageSha256, current.images[1].imageSha256);
+    assert.equal(current.search.requested, true);
+    assert.equal(current.search.needed, false);
+    assert.equal(current.search.state, "skipped");
+    assert.deepEqual(current.search.queries, []);
+    assert.equal(current.search.candidateCount, 0);
+
+    const historicalResponse = await s.request("/chat", {cookie, method: "POST", body: {
+        chatId, message: "What did the previous image show?"
+    }});
+    const historical = await getDiagnostic(s, cookie, historicalResponse.headers.get("x-request-id"));
+    assert.equal(historical.images.length, 1);
+    assert.equal(historical.images[0].attachmentId, second.id);
+    assert.equal(historical.images[0].position, 1);
+    assert.equal(historical.images[0].scope, "historical");
+    assert.match(historical.images[0].label, /Earlier image from message/);
+});
diff --git a/test/webSearch.test.js b/test/webSearch.test.js
index b37f880..f6c9964 100644
--- a/test/webSearch.test.js
+++ b/test/webSearch.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Prüft Suchentscheidungen, SearXNG, Quellenauswahl und die Einbindung der Websuche in Chat und Oberfläche.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import { createServer } from "node:http";
diff --git a/test/webSearchRegression.test.js b/test/webSearchRegression.test.js
index 6717c7b..f696a66 100644
--- a/test/webSearchRegression.test.js
+++ b/test/webSearchRegression.test.js
@@ -1,3 +1,6 @@
+/**
+ * @file Sichert ab, dass explizite und datumsbezogene Websuchen vor der Modellgenerierung passende Quellen liefern.
+ */
 import test from "node:test";
 import assert from "node:assert/strict";
 import {createServer} from "node:http";