Fix brand theme application and add comprehensive translations

- Fixed theme not being reflected on gallery and admin login pages
- Created GlobalThemeProvider to apply themes globally
- Updated gallery and admin login pages to use dynamic CSS variables
- Added complete translations for all admin sections in English and German:
  - Notifications management
  - Event view and creation
  - Photo upload functionality
  - Category management
  - Archive page view
  - Analytics dashboard
  - Branding and theme settings
  - System settings
  - CMS page management
  - Email configuration
- Fixed admin photo management display issues
- Fixed photo upload category assignment
- Added password reset functionality for galleries
- Improved error handling and user feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/routes/gallery.js

@@ -18,7 +18,9 @@ async function verifyGalleryAccess(req, res, next) {
     }
     
     const decoded = jwt.verify(token, process.env.JWT_SECRET);
-    const event = await db('events').where({ id: decoded.eventId, is_active: true }).first();
+    const event = await db('events')
+      .where({ id: decoded.eventId, is_active: true, is_archived: false })
+      .first();
     
     if (!event) {
       return res.status(404).json({ error: 'Gallery not found or expired' });
@@ -38,7 +40,7 @@ router.get('/:slug/verify-token/:token', async (req, res) => {
     const { slug, token } = req.params;
     
     const event = await db('events')
-      .where({ slug, is_active: true })
+      .where({ slug, is_active: true, is_archived: false })
       .select('id', 'share_link')
       .first();
     
@@ -67,13 +69,18 @@ router.get('/:slug/info', async (req, res) => {
     
     const event = await db('events')
       .where({ slug })
-      .select('event_name', 'event_type', 'event_date', 'expires_at', 'is_active', 'share_link')
+      .select('event_name', 'event_type', 'event_date', 'expires_at', 'is_active', 'is_archived', 'share_link')
       .first();
     
     if (!event) {
       return res.status(404).json({ error: 'Gallery not found' });
     }
     
+    // Check if event is archived
+    if (event.is_archived) {
+      return res.status(404).json({ error: 'Gallery has been archived and is no longer available' });
+    }
+    
     // If token provided, verify it matches the share link
     if (token) {
       const expectedToken = event.share_link.split('/').pop();
@@ -147,7 +154,7 @@ router.get('/:slug/photos', verifyGalleryAccess, async (req, res) => {
         id: photo.id,
         filename: photo.filename,
         url: `/photos/${photo.path}`,
-        thumbnail_url: photo.thumbnail_path ? `/${photo.thumbnail_path}` : null,
+        thumbnail_url: photo.thumbnail_path ? `/thumbnails/${path.basename(photo.thumbnail_path)}` : null,
         type: photo.type,
         category_id: photo.category_id,
         category_name: photo.category_name,
@@ -187,7 +194,7 @@ router.get('/:slug/download/:photoId', verifyGalleryAccess, async (req, res) =>
       photo_id: photoId
     });
     
-    const filePath = path.join(getStoragePath(), 'events/active', req.event.slug, photo.path);
+    const filePath = path.join(getStoragePath(), 'events/active', photo.path);
     
     // Get watermark settings
     const watermarkSettings = await watermarkService.getWatermarkSettings();
@@ -236,7 +243,7 @@ router.get('/:slug/download-all', verifyGalleryAccess, async (req, res) => {
     
     // Add photos to archive
     for (const photo of photos) {
-      const filePath = path.join(getStoragePath(), 'events/active', req.event.slug, photo.path);
+      const filePath = path.join(getStoragePath(), 'events/active', photo.path);
       
       if (watermarkSettings && watermarkSettings.enabled) {
         // Apply watermark