fix: resolve test failures in CI

- Frontend: Fix Svelte plugin hot module config for vitest
- Backend: Ensure conversation tracker uses mocked database in tests

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

dashboard/backend/tests/conftest.py

@@ -230,14 +230,16 @@ def mock_httpx_client():
 
 
 @pytest.fixture
-def test_app(mock_config, temp_auth_file, temp_rbac_file, mock_docker_client):
+def test_app(mock_config, temp_auth_file, temp_rbac_file, mock_docker_client, mock_conversation_db):
     """Create FastAPI test client with mocked dependencies."""
     # Reload routers to pick up new config values
     import importlib
 
     import routers.files
+    import routers.conversation_tracker
 
     importlib.reload(routers.files)
+    importlib.reload(routers.conversation_tracker)
 
     # Patch Docker client before importing main
     with patch("docker.DockerClient", return_value=mock_docker_client):