fix: resolve external media dimensions, gallery theme race condition, and add email color customization

- Fix dimension repair for external media by using photoResolver instead of hardcoded paths
- Extract photo dimensions via Sharp during external media import
- Remove duplicate theme useEffect from GalleryView to prevent flash/revert race condition
- Pass event welcome_message to Story layout footer for per-event customization
- Add email_primary_color/email_secondary_color settings with admin UI color pickers
- Add i18n keys for email branding in all 4 locales (en, de, ru, pt)

backend/src/routes/adminExternalMedia.js

@@ -5,6 +5,7 @@ const { adminAuth } = require('../middleware/auth');
 const { requirePermission } = require('../middleware/permissions');
 const { list, resolveExternalPath, getExternalMediaRoot } = require('../services/externalMediaService');
 const { db, logActivity } = require('../database/db');
+const sharp = require('sharp');
 const logger = require('../utils/logger');
 
 const router = express.Router();
@@ -108,6 +109,18 @@ router.post('/events/:id/import-external', adminAuth, requirePermission('photos.
           .first();
         if (exists) { skipped++; continue; }
         const stats = await fs.stat(f.full);
+
+        // Extract dimensions via Sharp
+        let width = null;
+        let height = null;
+        try {
+          const metadata = await sharp(f.full).metadata();
+          width = metadata.width || null;
+          height = metadata.height || null;
+        } catch (dimErr) {
+          logger.warn(`Could not extract dimensions for ${f.rel}: ${dimErr.message}`);
+        }
+
         const inserted = await db('photos')
           .insert({
             event_id: eventId,
@@ -117,6 +130,8 @@ router.post('/events/:id/import-external', adminAuth, requirePermission('photos.
             thumbnail_path: null,
             type,
             size_bytes: stats.size,
+            width,
+            height,
             source_origin: 'external',
             external_relpath: f.rel
           })

backend/src/routes/adminPhotoDimensions.js

@@ -3,11 +3,10 @@ const router = express.Router();
 const { db } = require('../database/db');
 const { adminAuth } = require('../middleware/auth');
 const { requirePermission } = require('../middleware/permissions');
-const path = require('path');
 const fs = require('fs').promises;
 const logger = require('../utils/logger');
 
-const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../../storage');
+const { resolvePhotoFilePath } = require('../services/photoResolver');
 
 // Module-level progress state
 let repairProgress = {
@@ -23,13 +22,18 @@ router.post('/repair-dimensions', adminAuth, requirePermission('photos.edit'), a
     }
 
     const photos = await db('photos')
+      .join('events', 'photos.event_id', 'events.id')
       .where(function () {
-        this.whereNull('width').orWhereNull('height');
+        this.whereNull('photos.width').orWhereNull('photos.height');
       })
       .where(function () {
-        this.where('media_type', '!=', 'video').orWhereNull('media_type');
+        this.where('photos.media_type', '!=', 'video').orWhereNull('photos.media_type');
       })
-      .select('id', 'path', 'filename');
+      .select(
+        'photos.id', 'photos.path', 'photos.filename',
+        'photos.source_origin', 'photos.external_relpath', 'photos.event_id',
+        'events.source_mode', 'events.external_path', 'events.slug'
+      );
 
     if (photos.length === 0) {
       return res.json({ message: 'No photos need dimension repair', count: 0 });
@@ -61,15 +65,16 @@ router.post('/repair-dimensions', adminAuth, requirePermission('photos.edit'), a
 
       for (const photo of photos) {
         try {
-          if (!photo.path) {
-            logger.warn(`Photo ${photo.id} has no path, skipping dimension repair`);
+          const event = { source_mode: photo.source_mode, external_path: photo.external_path, slug: photo.slug };
+          let fullPath;
+          try {
+            fullPath = resolvePhotoFilePath(event, photo);
+          } catch (err) {
+            logger.warn(`Photo ${photo.id} has no resolvable path, skipping dimension repair: ${err.message}`);
             errorCount++;
             continue;
           }
 
-          const storagePath = getStoragePath();
-          const fullPath = path.join(storagePath, 'events/active', photo.path);
-
           try {
             await fs.access(fullPath);
           } catch (err) {
@@ -85,8 +90,7 @@ router.post('/repair-dimensions', adminAuth, requirePermission('photos.edit'), a
               .where({ id: photo.id })
               .update({
                 width: metadata.width,
-                height: metadata.height,
-                updated_at: db.fn.now()
+                height: metadata.height
               });
             successCount++;