feat: add customizable Nitro client loading overlay with Filament settings

Add full Client Login Effect section to Theme & Buttons page with:
- Enable toggle, 30+ animation effects, customizable colors/logo/text
- 6 loading bar styles (sliding, dots, pulse, double, spinner, skeleton)
- Optimized to single DB query via WebsiteSetting::whereIn
- Overlay covers Nitro v3 internal loading (5s min, 15s fallback)

app/Http/Controllers/Client/NitroController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\Client;
 
 use App\Http\Controllers\Controller;
+use App\Models\Miscellaneous\WebsiteSetting;
 use Illuminate\View\View;
 
 class NitroController extends Controller
@@ -23,8 +24,34 @@ class NitroController extends Controller
 
         $sso = $user->ssoTicket();
 
+        $keys = [
+            'login_effect_enabled', 'login_effect_animation', 'login_effect_background',
+            'login_effect_icon_color', 'login_effect_text_color', 'login_effect_bar_color',
+            'login_effect_bar_style', 'login_effect_icon_size', 'login_effect_show_logo',
+            'login_effect_show_name', 'login_effect_custom_text',
+        ];
+
+        $settings = WebsiteSetting::whereIn('key', $keys)->pluck('value', 'key');
+
+        $loginData = null;
+        if (($settings['login_effect_enabled'] ?? '0') === '1') {
+            $loginData = [
+                'animation' => $settings['login_effect_animation'] ?? 'none',
+                'background' => $settings['login_effect_background'] ?? '#0f1922',
+                'icon_color' => $settings['login_effect_icon_color'] ?? '#eeb425',
+                'text_color' => $settings['login_effect_text_color'] ?? '#ffffff',
+                'bar_color' => $settings['login_effect_bar_color'] ?? '#eeb425',
+                'bar_style' => $settings['login_effect_bar_style'] ?? 'bar',
+                'icon_size' => $settings['login_effect_icon_size'] ?? '120',
+                'show_logo' => ($settings['login_effect_show_logo'] ?? '0') === '1',
+                'show_name' => ($settings['login_effect_show_name'] ?? '0') === '1',
+                'custom_text' => $settings['login_effect_custom_text'] ?? '',
+            ];
+        }
+
         return view('client.' . $view, [
             'sso' => $sso,
+            'loginData' => $loginData,
         ]);
     }
 }