fix(mcp): configure mcp_client after files are loaded

_load_active_project() was calling _configure_mcp_for_project() BEFORE
_refresh_from_project() which populates self.files. Now it calls
_refresh_from_project() first so mcp_client gets configured with the
actual file list that includes gencpp paths.

src/app_controller.py

@@ -1544,6 +1544,7 @@ class AppController:
    self.active_project_path = fallback_path
    if fallback_path not in self.project_paths:
     self.project_paths.append(fallback_path)
+  self._refresh_from_project()
   self._configure_mcp_for_project()
 
  def _prune_old_logs(self) -> None: