announce when a username leaves the room.

modified:   app.py
	modified:   templates/chat.html

app.py

@@ -542,7 +542,13 @@ def on_disconnect():
         room = Room.query.filter_by(name=room_name).first()
         room.remove_user(username)
         leave_room(room_name)
+        # Broadcast to all clients in the room that a user has left the room.
         emit("active_users", {"users": room.get_active_users()}, room=room_name)
+        emit(
+            "chat_message",
+            {"id": None, "content": f"{username} has left the room."},
+            room=room.name,
+        )
         # Remove session data from the database
         db.session.delete(user_session)
         db.session.commit()

templates/chat.html

@@ -36,6 +36,7 @@
                 <option value="claude-haiku">claude-haiku</option>
                 <option value="claude-sonnet">claude-sonnet</option>
                 <option value="claude-opus">claude-opus</option>
+                <option value="dall-e-3">dall-e-3</option>
             </select>
         </div>
         <div>
@@ -70,7 +71,7 @@ const VALID_VOICES = ['alloy', 'echo', 'fable', 'onyx', 'nova', 'shimmer'];
 const VALID_MODELS = [
     'None', 'gemini-flash', 'gemini-flash-8b', 'gemini-pro', 'grok-beta',
     'vllm/hermes-llama-3', 'gpt-4', 'gpt-4o-2024-08-06', 'gpt-mini',
-    'gpt-o1-mini', 'claude-haiku', 'claude-sonnet', 'claude-opus'
+    'gpt-o1-mini', 'claude-haiku', 'claude-sonnet', 'claude-opus', 'dall-e-3'
 ];
 
 // Configuration for DOMPurify to specify which tags and attributes are allowed