Display CMS: Upload-Fehler abfangen und kaputte Bilder im Player überspringen.

Mediathek-Uploads legen keinen Datensatz mehr an, wenn der Datei-Write
fehlschlägt (verhindert 404-Einträge auf den Displays). Der Player
überspringt Bilder mit Ladefehler nach 2s statt Schwarzbild zu zeigen.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Feature/DisplayVersionApiTest.php

@@ -444,6 +444,15 @@ test('display player keeps previews in a strict 9 by 16 viewport', function () {
         ->toContain('container-type: size;')
         ->toContain("if (hostname === 'cabinet.b2in.eu') {")
         ->toContain("return 'https://portal.b2in.eu';")
+        ->toContain('startConfigPolling')
+        ->toContain('startFileVersionPolling')
+        ->toContain('playerFileCheckUrl')
+        ->toContain('readPlayerFileVersion')
+        ->toContain('Player-Datei geändert')
+        ->toContain('Playlist geändert')
+        ->toContain('DISPLAY_PORTAL_BASE_URL')
+        ->toContain("url.startsWith('/_cabinet/')")
+        ->toContain('`${DISPLAY_PORTAL_BASE_URL}${url}`')
         ->toContain('/api/display/overview')
         ->toContain('Aktive Live-Displays')
         ->toContain('renderOverview(data.displays || [])')
@@ -481,6 +490,15 @@ test('display player keeps previews in a strict 9 by 16 viewport', function () {
         ->toContain('background: none');
 });
 
+test('display player skips broken images instead of showing a black frame', function () {
+    $player = file_get_contents(public_path('_cabinet/display/index.html'));
+
+    expect($player)
+        ->toContain('img.onerror = () => {')
+        ->toContain('[B2in] Image error:')
+        ->toContain('setTimeout(finish, 2000);');
+});
+
 test('display player stops looping when the playlist has no playable content', function () {
     $player = file_get_contents(public_path('_cabinet/display/index.html'));
 
@@ -510,10 +528,12 @@ test('preview player is served with a revalidation cache header', function () {
     $display = Display::factory()->create(['preview_token' => 'fresh-token']);
     $version = DisplayVersion::factory()->create();
 
-    foreach ([
-        '/preview/fresh-token',
-        "/preview/module/{$version->id}",
-    ] as $url) {
+    foreach (
+        [
+            '/preview/fresh-token',
+            "/preview/module/{$version->id}",
+        ] as $url
+    ) {
         $response = $this->get($url);
         $response->assertSuccessful();
         expect($response->headers->get('Cache-Control'))->toContain('no-cache');