style: custom CSS theme with top navigation from HTML design tokens

- Custom Filament CSS: Material colors (#0058be primary), Manrope/Inter fonts
- Top navigation bar 56px, white bg, border-bottom
- Sharper border-radius, custom badge colors, form input styling
- Similar Cases & Attachment Links redesigned to match HTML mockups
- AdminPanelProvider: topNavigation(), custom colors, renderHook CSS injection
- Dark mode overrides included

app/Providers/Filament/AdminPanelProvider.php

@@ -7,16 +7,20 @@ use Filament\Http\Middleware\AuthenticateSession;
 use Filament\Http\Middleware\DisableBladeIconComponents;
 use Filament\Http\Middleware\DispatchServingFilamentEvent;
 use Filament\Navigation\NavigationGroup;
+use Filament\Navigation\NavigationItem;
 use Filament\Pages\Dashboard;
 use Filament\Panel;
 use Filament\PanelProvider;
 use Filament\Support\Colors\Color;
+use Filament\Support\Facades\FilamentView;
+use Filament\View\PanelsRenderHook;
 use Filament\Widgets\AccountWidget;
 use Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse;
 use Illuminate\Cookie\Middleware\EncryptCookies;
 use Illuminate\Foundation\Http\Middleware\PreventRequestForgery;
 use Illuminate\Routing\Middleware\SubstituteBindings;
 use Illuminate\Session\Middleware\StartSession;
+use Illuminate\Support\Facades\Blade;
 use Illuminate\View\Middleware\ShareErrorsFromSession;
 
 class AdminPanelProvider extends PanelProvider
@@ -29,9 +33,17 @@ class AdminPanelProvider extends PanelProvider
             ->path('admin')
             ->login()
             ->brandName('AfterSales CRM')
+            ->topNavigation()
             ->colors([
-                'primary' => Color::Blue,
+                'primary' => '#0058be',
+                'secondary' => '#585f6c',
+                'gray' => '#585f6c',
+                'success' => '#10b981',
+                'warning' => '#f59e0b',
+                'danger' => '#ba1a1a',
+                'info' => '#3b82f6',
             ])
+            ->font('Inter')
             ->discoverResources(in: app_path('Filament/Resources'), for: 'App\Filament\Resources')
             ->discoverPages(in: app_path('Filament/Pages'), for: 'App\Filament\Pages')
             ->pages([
@@ -60,6 +72,14 @@ class AdminPanelProvider extends PanelProvider
             ])
             ->authMiddleware([
                 Authenticate::class,
-            ]);
+            ])
+            ->renderHook(
+                PanelsRenderHook::HEAD_END,
+                fn (): string => '<link rel="stylesheet" href="' . asset('css/filament-custom.css') . '">',
+            )
+            ->renderHook(
+                PanelsRenderHook::BODY_END,
+                fn (): string => '<link href="https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700;800&family=Material+Symbols+Outlined:wght,FILL@100..700,0..1&display=swap" rel="stylesheet">',
+            );
     }
 }