Add model selection, dashboard chat input, and model warming

- Add GET /api/chat/ps and POST /api/chat/warm endpoints for hot model
  visibility and pre-loading
- Extend PATCH /api/chat/conversations/:id to accept model in addition
  to title
- Add ModelSelector component with hot/cold indicators from Ollama /api/ps
- Add DashboardChatInput component (model selector + note picker + textarea)
  replacing the simple "New Chat" button on the dashboard
- Add model selector dropdown to ChatView header, persisted per-conversation
- Warm default model on dashboard mount via fire-and-forget background task
- Configure Ollama with OLLAMA_MAX_LOADED_MODELS=2 and OLLAMA_KEEP_ALIVE=30m
- Always-visible edit buttons on NoteCard/TaskCard (remove hover-only behavior)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/fabledassistant/routes/chat.py

@@ -15,7 +15,7 @@ from fabledassistant.services.chat import (
     list_conversations,
     save_response_as_note,
     summarize_conversation_as_note,
-    update_conversation_title,
+    update_conversation,
 )
 from fabledassistant.services.generation_buffer import (
     GenerationState,
@@ -83,9 +83,10 @@ async def update_conversation_route(conv_id: int):
     uid = get_current_user_id()
     data = await request.get_json()
     title = data.get("title")
-    if title is None:
-        return jsonify({"error": "title is required"}), 400
-    conv = await update_conversation_title(uid, conv_id, title)
+    model = data.get("model")
+    if title is None and model is None:
+        return jsonify({"error": "title or model is required"}), 400
+    conv = await update_conversation(uid, conv_id, title=title, model=model)
     if conv is None:
         return jsonify({"error": "Conversation not found"}), 404
     return jsonify(conv.to_dict())
@@ -233,6 +234,54 @@ async def summarize_conversation_route(conv_id: int):
         return jsonify({"error": str(e)}), 400
 
 
+@chat_bp.route("/ps", methods=["GET"])
+@login_required
+async def running_models_route():
+    """Return currently loaded (hot) models from Ollama."""
+    try:
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            resp = await client.get(f"{Config.OLLAMA_URL}/api/ps")
+            resp.raise_for_status()
+            data = resp.json()
+            models = [
+                {
+                    "name": m["name"],
+                    "size": m.get("size", 0),
+                    "size_vram": m.get("size_vram", 0),
+                    "expires_at": m.get("expires_at", ""),
+                }
+                for m in data.get("models", [])
+            ]
+            return jsonify({"models": models})
+    except Exception as e:
+        logger.debug("Failed to query Ollama /api/ps: %s", e)
+        return jsonify({"models": []})
+
+
+@chat_bp.route("/warm", methods=["POST"])
+@login_required
+async def warm_model_route():
+    """Pre-load a model into Ollama memory."""
+    data = await request.get_json(force=True, silent=True) or {}
+    model = data.get("model", "").strip()
+    if not model:
+        return jsonify({"error": "model is required"}), 400
+
+    async def _warm():
+        try:
+            async with httpx.AsyncClient(timeout=120.0) as client:
+                await client.post(
+                    f"{Config.OLLAMA_URL}/api/generate",
+                    json={"model": model, "prompt": "", "keep_alive": "30m"},
+                )
+            logger.info("Warmed model %s", model)
+        except Exception as e:
+            logger.warning("Failed to warm model %s: %s", model, e)
+
+    asyncio.create_task(_warm())
+    return jsonify({"status": "warming"}), 202
+
+
 @chat_bp.route("/status", methods=["GET"])
 @login_required
 async def chat_status_route():