feat: Nova homepage, profile redesign, and legacy view system overhaul

Homepage
- Add HomepageService with hero, trending (award-weighted), fresh uploads,
  popular tags, creator spotlight (weekly uploads ranking), and news sections
- Add React components: HomePage, HomeHero, HomeTrending, HomeFresh,
  HomeTags, HomeCreators, HomeNews (lazy-loaded below the fold)
- Wire home.blade.php with JSON props, SEO meta, JSON-LD, and hero preload
- Add HomePage.jsx to vite.config.js inputs

Profile page
- Hero banner with random user artwork as background + dark gradient overlay
- Favourites section uses real Artwork models + <x-artwork-card> for CDN URLs
- Newest artworks grid: gallery-grid → grid grid-cols-2 gap-4

Edit Profile page (user.blade.php)
- Add hero banner (featured wallpaper/photography via artwork_features,
  content_type_id IN [2,3]) sourced in UserController
- Remove bg-deep from outer wrapper; card backgrounds: bg-panel → bg-nova-800
- Remove stray AI-generated tag fragment from template

Author profile links
- Fix all /@username routes in: HomepageService, MonthlyCommentatorsController,
  LatestCommentsController, MyBuddiesController and corresponding blade views

Legacy view namespace
- Register View::addNamespace('legacy', resource_path('views/_legacy'))
  in AppServiceProvider::boot()
- Convert all view('legacy.x') and @include('legacy.x') calls to legacy::x
- Migrate legacy views to resources/views/_legacy/ with namespace support

app/Http/Controllers/User/UserController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\User;
 
 use App\Http\Controllers\Controller;
+use App\Models\Artwork;
 use Illuminate\Http\Request;
 
 class UserController extends Controller
@@ -20,8 +21,28 @@ class UserController extends Controller
             $profile = null;
         }
 
-        return view('legacy.user', [
-            'profile' => $profile,
+        // Hero background: prefer featured wallpapers or photography
+        $heroBgUrl = Artwork::public()
+            ->published()
+            ->whereNotNull('hash')
+            ->whereNotNull('thumb_ext')
+            ->whereHas('features', function ($q) {
+                $q->where('is_active', true)
+                  ->where(function ($q2) {
+                      $q2->whereNull('expires_at')->orWhere('expires_at', '>', now());
+                  });
+            })
+            ->whereHas('categories', function ($q) {
+                // content_type_id 2 = Wallpapers, 3 = Photography
+                $q->whereIn('content_type_id', [2, 3]);
+            })
+            ->inRandomOrder()
+            ->limit(1)
+            ->first()?->thumbUrl('lg');
+
+        return view('legacy::user', [
+            'profile'    => $profile,
+            'heroBgUrl'  => $heroBgUrl,
         ]);
     }
 }