feat(gui): Rename Context Hub to Project Settings

- gui_2.py: Window title changed to 'Project Settings'
- app_controller.py: show_windows key updated
- Updated tests to reference new name

src/app_controller.py

@@ -950,7 +950,7 @@ class AppController:
   bg_shader.get_bg().enabled = gui_cfg.get("bg_shader_enabled", False)
   
   _default_windows = {
-   "Context Hub": True,
+   "Project Settings": True,
    "Files & Media": True,
    "AI Settings": True,
    "MMA Dashboard": True,