fix(gui): prevent dictionary size change during iteration

- Wrap discussions.items() with list() in takes_panel to prevent
  RuntimeError when dictionary changes during iteration
- This was causing crashes when switching discussions

src/app_controller.py

@@ -1544,7 +1544,6 @@ 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:

src/gui_2.py

@@ -3024,7 +3024,7 @@ class App:
    imgui.table_setup_column("Entries", imgui.TableColumnFlags_.width_fixed, 80)
    imgui.table_setup_column("Actions", imgui.TableColumnFlags_.width_fixed, 150)
    imgui.table_headers_row()
-   for name, disc in discussions.items():
+   for name, disc in list(discussions.items()):
     imgui.table_next_row()
     imgui.table_set_column_index(0)
     is_active = name == self.active_discussion