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>

resources/views/admin/events/index.blade.php

@@ -7,7 +7,7 @@
     </div>
 
     {{-- Filter --}}
-    <form method="GET" class="mb-4 flex gap-3">
+    <form method="GET" class="mb-4 flex flex-wrap gap-3">
         <select name="team_id" onchange="this.form.submit()" class="px-3 py-2 border border-gray-300 rounded-md text-sm">
             <option value="">{{ __('ui.all_teams') }}</option>
             @foreach ($teams as $team)
@@ -20,6 +20,14 @@
                 <option value="{{ $status->value }}" {{ request('status') === $status->value ? 'selected' : '' }}>{{ $status->label() }}</option>
             @endforeach
         </select>
+        @if ($seasons->isNotEmpty())
+            <select name="season_id" onchange="this.form.submit()" class="px-3 py-2 border border-gray-300 rounded-md text-sm">
+                <option value="">{{ __('admin.all_seasons') }}</option>
+                @foreach ($seasons as $season)
+                    <option value="{{ $season->id }}" {{ request('season_id') == $season->id ? 'selected' : '' }}>{{ $season->name }}{{ $season->is_current ? ' ●' : '' }}</option>
+                @endforeach
+            </select>
+        @endif
     </form>
 
     {{-- Event-Karten --}}