make some overall QoL improvements

public/js/composerController.js

@@ -2,6 +2,7 @@
 import * as defaultApi from "./api.js";
 import {updateReasoning, finishReasoning} from "./reasoning.js";
 import {createStreamRenderer} from "./streamRenderer.js";
+import {titleFromFirstMessage} from "./chatTitle.js";
 
 export function createComposerController({
     state, elements, attachmentComposer, webSearchButton, reasoningToggle, webSearchToggle,
@@ -98,7 +99,7 @@ export function createComposerController({
             }
             const currentChat = getChatById(chatId);
             if (currentChat && !currentChat.assistant_persona_id && currentChat.title === "New chat") {
-                const title = message.length > 40 ? `${message.slice(0, 40)}...` : message;
+                const title = titleFromFirstMessage(message);
                 const renamed = await api.put(`/chats/${chatId}`, {title}, {signal});
                 signal.throwIfAborted();
                 if (renamed.error) throw new Error(renamed.error);
@@ -150,6 +151,12 @@ export function createComposerController({
             }, {signal});
             rendering.flush();
             rendering.dispose();
+            const updatedChat = getChatById(chatId);
+            if (updatedChat && completedReply !== null) {
+                updatedChat.last_message_preview = completedReply.slice(0, 180);
+                updatedChat.updated_at = new Date().toISOString();
+                renderChatList();
+            }
             // Keep a completed answer in both state and the DOM until history replaces it.
             if (visible()) {
                 const reply = {role: "bot", content: completedReply, modelName: model,