feat(admin): add persistent login and improve audio playback error handling

app/admin/page.tsx

@@ -39,12 +39,22 @@ export default function AdminPage() {
     const [playingSongId, setPlayingSongId] = useState<number | null>(null);
     const [audioElement, setAudioElement] = useState<HTMLAudioElement | null>(null);
 
+    // Check for existing auth on mount
+    useEffect(() => {
+        const authToken = localStorage.getItem('hoerdle_admin_auth');
+        if (authToken === 'authenticated') {
+            setIsAuthenticated(true);
+            fetchSongs();
+        }
+    }, []);
+
     const handleLogin = async () => {
         const res = await fetch('/api/admin/login', {
             method: 'POST',
             body: JSON.stringify({ password }),
         });
         if (res.ok) {
+            localStorage.setItem('hoerdle_admin_auth', 'authenticated');
             setIsAuthenticated(true);
             fetchSongs();
         } else {
@@ -147,9 +157,25 @@ export default function AdminPage() {
 
             // Play new song
             const audio = new Audio(`/uploads/${song.filename}`);
-            audio.play();
+
+            // Handle playback errors
+            audio.onerror = () => {
+                alert(`Failed to load audio file: ${song.filename}\nThe file may be corrupted or missing.`);
+                setPlayingSongId(null);
+                setAudioElement(null);
+            };
+
+            audio.play()
+                .then(() => {
                     setAudioElement(audio);
                     setPlayingSongId(song.id);
+                })
+                .catch((error) => {
+                    console.error('Playback error:', error);
+                    alert(`Failed to play audio: ${error.message}`);
+                    setPlayingSongId(null);
+                    setAudioElement(null);
+                });
 
             // Reset when song ends
             audio.onended = () => {