feat(settings): add add_countdown_slide toggle

New key/value setting in the Export-Dateien submenu, seeded to '0' and
allowlisted in SettingsController. Controls whether a countdown standby
slide is prepended to playlist exports.

app/Http/Controllers/SettingsController.php

@@ -31,6 +31,7 @@ class SettingsController extends Controller
         'namenseinblender_macro_id',
         'song_prefix_label_id',
         'song_postfix_label_id',
+        'add_countdown_slide',
     ];
 
     public function index(): Response

database/seeders/CcliSettingsSeeder.php

@@ -13,5 +13,10 @@ public function run(): void
             ['key' => 'default_translation_language'],
             ['value' => 'DE'],
         );
+
+        Setting::firstOrCreate(
+            ['key' => 'add_countdown_slide'],
+            ['value' => '0'],
+        );
     }
 }

resources/js/Pages/Settings.vue

@@ -289,12 +289,30 @@ watch(songPostfixLabelId, (value) => {
                             </div>
 
                             <!-- Task 7: Export-Dateien submenu -->
-                            <ExportProFiles
-                                v-if="activeSubmenu === 'export-files'"
-                                :prefix-files="export_pro_files.prefix"
-                                :postfix-files="export_pro_files.postfix"
-                                :keyword-files="export_pro_files.keyword"
-                            />
+                            <div v-if="activeSubmenu === 'export-files'" class="space-y-8">
+                                <!-- Countdown-Folie Toggle -->
+                                <label class="flex cursor-pointer items-start gap-3 rounded-lg border border-gray-200 p-4">
+                                    <input
+                                        type="checkbox"
+                                        class="mt-0.5 h-4 w-4 shrink-0 rounded border-gray-300 text-amber-600 focus:ring-amber-500"
+                                        data-testid="setting-add-countdown-slide"
+                                        :checked="settings.add_countdown_slide === '1'"
+                                        @change="updateSetting('add_countdown_slide', $event.target.checked ? '1' : '0')"
+                                    />
+                                    <span class="min-w-0">
+                                        <span class="block text-sm font-semibold text-gray-900">Countdown-Folie hinzufügen</span>
+                                        <span class="mt-1 block text-xs text-gray-500">
+                                            Fügt am Anfang eine Folie mit Keyvisual und Uhrzeit-Timer (hh:mm) oben links hinzu.
+                                        </span>
+                                    </span>
+                                </label>
+
+                                <ExportProFiles
+                                    :prefix-files="export_pro_files.prefix"
+                                    :postfix-files="export_pro_files.postfix"
+                                    :keyword-files="export_pro_files.keyword"
+                                />
+                            </div>
                         </div>
                     </div>
                 </div>

tests/Feature/SettingsControllerCountdownSlideTest.php

@@ -0,0 +1,58 @@
+<?php
+
+use App\Models\Setting;
+use App\Models\User;
+
+beforeEach(function () {
+    $this->user = User::factory()->create();
+});
+
+test('settings index includes add_countdown_slide in props', function () {
+    $response = $this->actingAs($this->user)
+        ->withoutVite()
+        ->get(route('settings.index'));
+
+    $response->assertInertia(
+        fn ($page) => $page
+            ->component('Settings')
+            ->has('settings.add_countdown_slide')
+    );
+});
+
+test('patch add_countdown_slide to 1 persists', function () {
+    $response = $this->actingAs($this->user)
+        ->patchJson(route('settings.update'), [
+            'key' => 'add_countdown_slide',
+            'value' => '1',
+        ]);
+
+    $response->assertOk()
+        ->assertJson(['success' => true]);
+
+    expect(Setting::get('add_countdown_slide'))->toBe('1');
+});
+
+test('patch add_countdown_slide to 0 persists', function () {
+    Setting::set('add_countdown_slide', '1');
+
+    $response = $this->actingAs($this->user)
+        ->patchJson(route('settings.update'), [
+            'key' => 'add_countdown_slide',
+            'value' => '0',
+        ]);
+
+    $response->assertOk()
+        ->assertJson(['success' => true]);
+
+    expect(Setting::get('add_countdown_slide'))->toBe('0');
+});
+
+test('patch with unknown key returns 422', function () {
+    $response = $this->actingAs($this->user)
+        ->patchJson(route('settings.update'), [
+            'key' => 'unknown_setting_key',
+            'value' => 'some value',
+        ]);
+
+    $response->assertUnprocessable();
+});