fix: restore accidentally deleted admin specials editor page

app/admin/specials/[id]/page.tsx

@@ -0,0 +1,89 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import { useParams, useRouter, usePathname } from 'next/navigation';
+import CurateSpecialEditor, { CurateSpecial } from '@/components/CurateSpecialEditor';
+
+export default function SpecialEditorPage() {
+    const params = useParams();
+    const router = useRouter();
+    const pathname = usePathname();
+    const specialId = params.id as string;
+
+    // Locale aus dem Pfad ableiten (/en/..., /de/...)
+    const localeFromPath = pathname?.split('/')[1] as 'de' | 'en' | undefined;
+    const locale: 'de' | 'en' = localeFromPath === 'de' || localeFromPath === 'en' ? localeFromPath : 'en';
+
+    const [special, setSpecial] = useState<CurateSpecial | null>(null);
+    const [loading, setLoading] = useState(true);
+
+    const fetchSpecial = async (showLoading = true) => {
+        try {
+            if (showLoading) {
+                setLoading(true);
+            }
+            const res = await fetch(`/api/specials/${specialId}`);
+            if (res.ok) {
+                const data = await res.json();
+                setSpecial(data);
+            }
+        } catch (error) {
+            console.error('Error fetching special:', error);
+        } finally {
+            if (showLoading) {
+                setLoading(false);
+            }
+        }
+    };
+
+    useEffect(() => {
+        fetchSpecial(true);
+    }, [specialId]);
+
+    const handleSaveStartTime = async (songId: number, startTime: number) => {
+        const res = await fetch(`/api/specials/${specialId}/songs`, {
+            method: 'PUT',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ songId, startTime }),
+        });
+
+        if (!res.ok) {
+            const errorText = await res.text().catch(() => res.statusText || 'Unknown error');
+            console.error('Error updating special song (admin):', res.status, errorText);
+            throw new Error(`Failed to save start time: ${errorText}`);
+        } else {
+            // Reload special data to update the start time in the song list
+            await fetchSpecial(false);
+        }
+    };
+
+    if (loading) {
+        return (
+            <div style={{ padding: '2rem', textAlign: 'center' }}>
+                <p>Loading...</p>
+            </div>
+        );
+    }
+
+    if (!special) {
+        return (
+            <div style={{ padding: '2rem', textAlign: 'center' }}>
+                <p>Special not found</p>
+                <button onClick={() => router.push('/admin')}>Back to Admin</button>
+            </div>
+        );
+    }
+
+    return (
+        <CurateSpecialEditor
+            special={special}
+            locale={locale}
+            onBack={() => router.push('/admin')}
+            onSaveStartTime={handleSaveStartTime}
+            backLabel="← Back to Admin"
+            headerPrefix="Edit Special:"
+            noSongsSubHint="Go back to the admin dashboard to add songs to this special."
+        />
+    );
+}
+