feat: add back to main page buttons in admin and login

prisma/schema.prisma

@@ -35,6 +35,7 @@ model MediaItem {
 
   // Publication
   published        Boolean @default(false)
+  wasOncePublished Boolean @default(false)
 
   // Layout / Placement
   featured      Boolean       @default(false) // Prominent/title image

src/app/admin/login/page.tsx

@@ -2,6 +2,7 @@
 
 import React, { useState } from 'react';
 import { useRouter } from 'next/navigation';
+import Link from 'next/link';
 
 export default function AdminLoginPage() {
   const [password, setPassword] = useState('');
@@ -56,6 +57,9 @@ export default function AdminLoginPage() {
         <button type="submit" className="btn-primary" style={{ justifyContent: 'center' }} disabled={loading}>
           {loading ? 'Laden...' : 'Anmelden'}
         </button>
+        <Link href="/" className="btn-secondary" style={{ display: 'flex', justifyContent: 'center', marginTop: '10px', textDecoration: 'none' }}>
+          Zurück zur Hauptseite
+        </Link>
       </form>
     </div>
   );

src/app/admin/page.tsx

@@ -9,6 +9,7 @@ type MediaItem = {
   relativePath: string;
   filename: string;
   published: boolean;
+  wasOncePublished: boolean;
   featured: boolean;
   mediaType: string;
 };
@@ -77,7 +78,7 @@ export default function AdminDashboard() {
   const togglePublished = async (id: number, current: boolean) => {
     // Optimistic UI
     setItems((prev) =>
-      prev.map((i) => (i.id === id ? { ...i, published: !current } : i))
+      prev.map((i) => (i.id === id ? { ...i, published: !current, ...( !current ? { wasOncePublished: true } : {} ) } : i))
     );
     setStats((prev) => ({
       ...prev,
@@ -123,7 +124,11 @@ export default function AdminDashboard() {
     
     // Optimistic UI
     setItems((prev) =>
-      prev.map((i) => ({ ...i, published: isPublished }))
+      prev.map((i) => ({ 
+        ...i, 
+        published: isPublished,
+        ...(isPublished ? { wasOncePublished: true } : {})
+      }))
     );
     setStats({
       total: items.length,
@@ -150,6 +155,7 @@ export default function AdminDashboard() {
       <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '20px', flexWrap: 'wrap', gap: '10px' }}>
         <h2 style={{ fontSize: '1.5rem', fontFamily: 'var(--font-display)' }}>Admin Dashboard</h2>
         <div style={{ display: 'flex', gap: '10px' }}>
+          <Link href="/" className="btn-secondary" style={{ textDecoration: 'none' }}>Zurück zur Hauptseite</Link>
           <button className="btn-secondary" onClick={handleScan}>Neu Scannen</button>
           <Link href="/admin/layout" className="btn-secondary" style={{ textDecoration: 'none' }}>Layout Editor</Link>
           <button className="btn-primary" onClick={handleLogout}>Logout</button>

src/app/api/admin/media/[id]/route.ts

@@ -37,6 +37,7 @@ export async function PATCH(
       where: { id },
       data: {
         ...(published !== undefined && { published }),
+        ...(published === true && { wasOncePublished: true }),
         ...(featured !== undefined && { featured }),
         ...(placementMode !== undefined && { placementMode }),
         ...(gridColumn !== undefined && { gridColumn }),

src/app/api/admin/media/bulk/route.ts

@@ -24,7 +24,10 @@ export async function PATCH(request: NextRequest) {
       where: {
         id: { in: ids }
       },
-      data: { published }
+      data: { 
+        published,
+        ...(published === true ? { wasOncePublished: true } : {})
+      }
     });
 
     if (result.count > 0) {