make some overall QoL improvements

src/services/attachmentService.js

@@ -162,7 +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);
@@ -178,9 +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}`});

src/services/chatService.js

@@ -584,7 +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