fix(journey): album photos, select-all, heading/hr fixes, dark mode

- Load actual album photos instead of date-range search fallback
  (new GET /albums/:id/photos for Immich + Synology)
- Add select all / deselect all toggle in photo picker
- Normalize Markdown headings to plain text in journal stories
- Fix setext headings (---) rendering as hr instead of h2
- Add remark-breaks for proper line break rendering
- Fix pros/cons dark mode gradient backgrounds
- i18n: selectAll/deselectAll in 14 languages

server/src/services/memories/synologyService.ts

@@ -452,6 +452,36 @@ export async function listSynologyAlbums(userId: number): Promise<ServiceResult<
 }
 
 
+export async function getSynologyAlbumPhotos(userId: number, albumId: string): Promise<ServiceResult<AssetsList>> {
+    const allItems: SynologyPhotoItem[] = [];
+    const pageSize = 1000;
+    let offset = 0;
+
+    while (true) {
+        const result = await _requestSynologyApi<{ list: SynologyPhotoItem[] }>(userId, {
+            api: 'SYNO.Foto.Browse.Item',
+            method: 'list',
+            version: 1,
+            album_id: Number(albumId),
+            offset,
+            limit: pageSize,
+            additional: ['thumbnail'],
+        });
+        if (!result.success) return result as ServiceResult<AssetsList>;
+        const items = result.data.list || [];
+        allItems.push(...items);
+        if (items.length < pageSize) break;
+        offset += pageSize;
+    }
+
+    const assets = allItems.map(item => ({
+        id: String(item.additional?.thumbnail?.cache_key || item.id || ''),
+        takenAt: item.time ? new Date(item.time * 1000).toISOString() : '',
+    })).filter(a => a.id);
+
+    return success({ assets, total: assets.length, hasMore: false });
+}
+
 export async function syncSynologyAlbumLink(userId: number, tripId: string, linkId: string, sid: string): Promise<ServiceResult<SyncAlbumResult>> {
     const response = getAlbumIdFromLink(tripId, linkId, userId);
     if (!response.success) return response as ServiceResult<SyncAlbumResult>;