Finalize scoring system, release year integration, and fix song deletion

app/admin/page.tsx

@@ -40,6 +40,7 @@ interface Song {
     artist: string;
     filename: string;
     createdAt: string;
+    releaseYear: number | null;
     activations: number;
     puzzles: DailyPuzzle[];
     genres: Genre[];
@@ -48,7 +49,7 @@ interface Song {
     ratingCount: number;
 }
 
-type SortField = 'id' | 'title' | 'artist' | 'createdAt';
+type SortField = 'id' | 'title' | 'artist' | 'createdAt' | 'releaseYear';
 type SortDirection = 'asc' | 'desc';
 
 export default function AdminPage() {
@@ -91,6 +92,7 @@ export default function AdminPage() {
     const [editingId, setEditingId] = useState<number | null>(null);
     const [editTitle, setEditTitle] = useState('');
     const [editArtist, setEditArtist] = useState('');
+    const [editReleaseYear, setEditReleaseYear] = useState<number | ''>('');
     const [editGenreIds, setEditGenreIds] = useState<number[]>([]);
     const [editSpecialIds, setEditSpecialIds] = useState<number[]>([]);
 
@@ -577,6 +579,7 @@ export default function AdminPage() {
         setEditingId(song.id);
         setEditTitle(song.title);
         setEditArtist(song.artist);
+        setEditReleaseYear(song.releaseYear || '');
         setEditGenreIds(song.genres.map(g => g.id));
         setEditSpecialIds(song.specials ? song.specials.map(s => s.id) : []);
     };
@@ -585,6 +588,7 @@ export default function AdminPage() {
         setEditingId(null);
         setEditTitle('');
         setEditArtist('');
+        setEditReleaseYear('');
         setEditGenreIds([]);
         setEditSpecialIds([]);
     };
@@ -597,6 +601,7 @@ export default function AdminPage() {
                 id,
                 title: editTitle,
                 artist: editArtist,
+                releaseYear: editReleaseYear === '' ? null : Number(editReleaseYear),
                 genreIds: editGenreIds,
                 specialIds: editSpecialIds
             }),
@@ -706,10 +711,15 @@ export default function AdminPage() {
     });
 
     const sortedSongs = [...filteredSongs].sort((a, b) => {
-        // Handle numeric sorting for ID
+        // Handle numeric sorting for ID and Release Year
         if (sortField === 'id') {
             return sortDirection === 'asc' ? a.id - b.id : b.id - a.id;
         }
+        if (sortField === 'releaseYear') {
+            const yearA = a.releaseYear || 0;
+            const yearB = b.releaseYear || 0;
+            return sortDirection === 'asc' ? yearA - yearB : yearB - yearA;
+        }
 
         // String sorting for other fields
         const valA = String(a[sortField]).toLowerCase();
@@ -1223,10 +1233,15 @@ export default function AdminPage() {
                                     style={{ padding: '0.75rem', cursor: 'pointer', userSelect: 'none' }}
                                     onClick={() => handleSort('title')}
                                 >
-                                    Title {sortField === 'title' && (sortDirection === 'asc' ? '↑' : '↓')}
+                                    Song {sortField === 'title' && (sortDirection === 'asc' ? '↑' : '↓')}
                                 </th>
-
-                                <th style={{ padding: '0.75rem' }}>Genres</th>
+                                <th
+                                    style={{ padding: '0.75rem', cursor: 'pointer', userSelect: 'none' }}
+                                    onClick={() => handleSort('releaseYear')}
+                                >
+                                    Year {sortField === 'releaseYear' && (sortDirection === 'asc' ? '↑' : '↓')}
+                                </th>
+                                <th style={{ padding: '0.75rem' }}>Genres / Specials</th>
                                 <th
                                     style={{ padding: '0.75rem', cursor: 'pointer', userSelect: 'none' }}
                                     onClick={() => handleSort('createdAt')}
@@ -1263,6 +1278,16 @@ export default function AdminPage() {
                                                     placeholder="Artist"
                                                 />
                                             </td>
+                                            <td style={{ padding: '0.75rem' }}>
+                                                <input
+                                                    type="number"
+                                                    value={editReleaseYear}
+                                                    onChange={e => setEditReleaseYear(e.target.value === '' ? '' : Number(e.target.value))}
+                                                    className="form-input"
+                                                    style={{ padding: '0.25rem', width: '80px' }}
+                                                    placeholder="Year"
+                                                />
+                                            </td>
                                             <td style={{ padding: '0.75rem' }}>
                                                 <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.25rem' }}>
                                                     {genres.map(genre => (
@@ -1369,6 +1394,9 @@ export default function AdminPage() {
                                                     })}
                                                 </div>
                                             </td>
+                                            <td style={{ padding: '0.75rem', color: '#666' }}>
+                                                {song.releaseYear || '-'}
+                                            </td>
                                             <td style={{ padding: '0.75rem' }}>
                                                 <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.25rem' }}>
                                                     {song.genres?.map(g => (