Refactor navigation and remove unused navigator extensions across staff features

- Removed background color from CreateOrderView, OneTimeOrderView, and RapidOrderView.
- Updated navigation paths in OneTimeOrderView and other staff authentication pages to use new constants.
- Deleted unused navigator extensions for staff authentication, home, profile, and shifts.
- Refactored navigation in StaffMainModule to use new path constants.
- Cleaned up imports and adjusted navigation calls in various staff-related pages and widgets.

apps/mobile/apps/staff/lib/main.dart

@@ -27,9 +27,9 @@ class AppModule extends Module {
   @override
   void routes(RouteManager r) {
     // Set the initial route to the authentication module
-    r.module("/", module: staff_authentication.StaffAuthenticationModule());
+    r.module(StaffPaths.root, module: staff_authentication.StaffAuthenticationModule());
 
-    r.module('/worker-main', module: staff_main.StaffMainModule());
+    r.module(StaffPaths.main, module: staff_main.StaffMainModule());
   }
 }