Add settings page, model management, and chat UX improvements

- Settings infrastructure: key-value settings table, GET/PUT API, Pinia store
- Configurable assistant name (default "Fable") in settings and LLM system prompt
- Model catalog with 18 models in 3 categories (General Purpose, Coding,
  Uncensored / Creative Writing) with download/select/remove functionality
- Move Ollama status indicator from chat views to global nav bar
- Chat bubble layout: user messages right-aligned, assistant left-aligned
- Floating dark input bar with auto-focus and circular send button
- Fix HTML entity rendering (' apostrophe issue in marked/DOMPurify pipeline)
- Fix new chat button navigation (fetchConversation before router.push)
- Recent chats section on home page with "New Chat" button
- Update summary.md with Phase 4.5 changes

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

src/fabledassistant/routes/chat.py

@@ -15,7 +15,8 @@ from fabledassistant.services.chat import (
     summarize_conversation_as_note,
     update_conversation_title,
 )
-from fabledassistant.services.llm import build_context, stream_chat
+from fabledassistant.services.llm import build_context, ensure_model, stream_chat
+from fabledassistant.services.settings import get_setting
 
 logger = logging.getLogger(__name__)
 
@@ -97,7 +98,7 @@ async def send_message_route(conv_id: int):
     # Build context with note search, URL fetching, etc.
     messages = await build_context(history, context_note_id, content)
 
-    model = conv.model or Config.OLLAMA_MODEL
+    model = conv.model or await get_setting("default_model", Config.OLLAMA_MODEL)
 
     async def generate():
         full_response = []
@@ -149,7 +150,7 @@ async def summarize_conversation_route(conv_id: int):
     conv = await get_conversation(conv_id)
     if conv is None:
         return jsonify({"error": "Conversation not found"}), 404
-    model = conv.model or Config.OLLAMA_MODEL
+    model = conv.model or await get_setting("default_model", Config.OLLAMA_MODEL)
     try:
         note = await summarize_conversation_as_note(conv_id, model)
         return jsonify(note), 201
@@ -160,7 +161,7 @@ async def summarize_conversation_route(conv_id: int):
 @chat_bp.route("/status", methods=["GET"])
 async def chat_status_route():
     """Check Ollama availability and model readiness."""
-    default_model = Config.OLLAMA_MODEL
+    default_model = await get_setting("default_model", Config.OLLAMA_MODEL)
     result = {
         "ollama": "unavailable",
         "model": "not_found",
@@ -196,3 +197,41 @@ async def list_models_route():
     except Exception as e:
         logger.warning("Failed to list Ollama models: %s", e)
         return jsonify({"models": [], "error": str(e)}), 200
+
+
+@chat_bp.route("/models/pull", methods=["POST"])
+async def pull_model_route():
+    """Pull a model from Ollama. Runs in the background."""
+    data = await request.get_json()
+    model_name = data.get("model", "").strip()
+    if not model_name:
+        return jsonify({"error": "model is required"}), 400
+
+    import asyncio
+    asyncio.create_task(ensure_model(model_name))
+    return jsonify({"status": "pulling", "model": model_name}), 202
+
+
+@chat_bp.route("/models/delete", methods=["POST"])
+async def delete_model_route():
+    """Delete a model from Ollama."""
+    data = await request.get_json()
+    model_name = data.get("model", "").strip()
+    if not model_name:
+        return jsonify({"error": "model is required"}), 400
+
+    try:
+        async with httpx.AsyncClient(timeout=30.0) as client:
+            resp = await client.request(
+                "DELETE",
+                f"{Config.OLLAMA_URL}/api/delete",
+                json={"name": model_name},
+            )
+            resp.raise_for_status()
+        return jsonify({"status": "deleted", "model": model_name})
+    except httpx.HTTPStatusError as e:
+        logger.warning("Failed to delete model %s: %s", model_name, e)
+        return jsonify({"error": f"Failed to delete model: {e.response.status_code}"}), 400
+    except Exception as e:
+        logger.warning("Failed to delete model %s: %s", model_name, e)
+        return jsonify({"error": str(e)}), 500

src/fabledassistant/routes/settings.py

@@ -0,0 +1,22 @@
+from quart import Blueprint, jsonify, request
+
+from fabledassistant.services.settings import get_all_settings, set_setting
+
+settings_bp = Blueprint("settings", __name__, url_prefix="/api/settings")
+
+
+@settings_bp.route("", methods=["GET"])
+async def get_settings_route():
+    settings = await get_all_settings()
+    return jsonify(settings)
+
+
+@settings_bp.route("", methods=["PUT"])
+async def update_settings_route():
+    data = await request.get_json()
+    if not isinstance(data, dict):
+        return jsonify({"error": "Expected a JSON object"}), 400
+    for key, value in data.items():
+        await set_setting(key, str(value))
+    settings = await get_all_settings()
+    return jsonify(settings)