Feature-based folder structure

1. Created feature-based folder structure - Components now organized by domain feature
  2. Moved all components - 20+ files moved to new locations
  3. Updated _Imports.razor - Added all new namespace paths for global component access
  4. Updated CustomThemes.cs namespace - Changed from WebApp.Components.Layout to WebApp.Components.Shared.Layout
  5. Removed old using directives - Cleaned up Login.razor and Routes.razor
  6. Removed empty directories - Cleaned up old folder structure

WebApp/Components/Routes.razor

@@ -1,5 +1,4 @@
-@using WebApp.Components.Layout
-@inject NavigationManager navigationManager
+@inject NavigationManager navigationManager
 
 <Router AppAssembly="typeof(Program).Assembly">
     <Found Context="routeData">