UI-Verbesserungen, PWA-Icons, Branding und Settings-Erweiterung

Invertiertes Logo für Admin-Navbar, neue PWA-Icons, Manifest-Updates,
Tailwind-Config-Extraktion, Farb-/Namenseinstellungen im Admin-Bereich
und diverse Layout-Optimierungen.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/Admin/SettingsController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers\Admin;
 use App\Http\Controllers\Controller;
 use App\Models\ActivityLog;
 use App\Models\FileCategory;
+use App\Models\Season;
 use App\Models\Setting;
 use App\Services\HtmlSanitizerService;
 use App\Services\SupportApiService;
@@ -78,10 +79,12 @@ class SettingsController extends Controller
             'from_name' => config('mail.from.name'),
         ];
 
+        $seasons = Season::orderByDesc('start_date')->get();
+
         return view('admin.settings.edit', compact(
             'settings', 'eventDefaults', 'fileCategories', 'visibilitySettings',
             'isRegistered', 'installationId', 'updateInfo',
-            'availableLocales', 'localeSettings', 'mailConfig'
+            'availableLocales', 'localeSettings', 'mailConfig', 'seasons'
         ));
     }