feat(photos): add square medium variant for sharp grid thumbnails

backend/internal/photos/sqlite_store.go

@@ -22,6 +22,7 @@ func NewSQLiteStore(db *sql.DB) *SQLiteStore { return &SQLiteStore{db: db} }
 const sqlitePhotoColumns = `p.id, COALESCE(p.album_id, ''), p.uploader_id,
 	COALESCE(o_o.storage_key, ''),
 	COALESCE(o_t.storage_key, ''),
+	COALESCE(o_m.storage_key, ''),
 	COALESCE(o_p.storage_key, ''),
 	p.original_filename, COALESCE(o_o.size, 0), COALESCE(o_o.width, 0), COALESCE(o_o.height, 0), COALESCE(o_o.mime_type, ''),
 	p.taken_at, p.latitude, p.longitude, COALESCE(p.caption, ''), p.created_at,
@@ -40,6 +41,8 @@ const sqlitePhotoJoins = `
 	LEFT JOIN objects o_o ON o_o.id = po_o.object_id
 	LEFT JOIN photo_objects po_t ON po_t.photo_id = p.id AND po_t.role = 'thumb'
 	LEFT JOIN objects o_t ON o_t.id = po_t.object_id
+	LEFT JOIN photo_objects po_m ON po_m.photo_id = p.id AND po_m.role = 'medium'
+	LEFT JOIN objects o_m ON o_m.id = po_m.object_id
 	LEFT JOIN photo_objects po_p ON po_p.photo_id = p.id AND po_p.role = 'preview'
 	LEFT JOIN objects o_p ON o_p.id = po_p.object_id`
 
@@ -50,7 +53,7 @@ func scanSQLitePhoto(scan func(...any) error) (*models.Photo, error) {
 	var lat, long sql.NullFloat64
 	var liked int
 	if err := scan(&p.ID, &p.AlbumID, &p.UploaderID, &p.StorageKey,
-		&p.ThumbKey, &p.PreviewKey,
+		&p.ThumbKey, &p.MediumKey, &p.PreviewKey,
 		&p.OriginalFilename, &p.Size, &p.Width, &p.Height, &p.MimeType,
 		&takenAt, &lat, &long, &p.Caption, &createdAt,
 		&p.Uploader.ID, &p.Uploader.Name, &p.Uploader.AvatarURL,
@@ -271,7 +274,7 @@ func (s *SQLiteStore) ListTrash(ctx context.Context, userID string) ([]models.Ph
 		var lat, long sql.NullFloat64
 		var liked int
 		if err := rows.Scan(&p.ID, &p.AlbumID, &p.UploaderID, &p.StorageKey,
-			&p.ThumbKey, &p.PreviewKey,
+			&p.ThumbKey, &p.MediumKey, &p.PreviewKey,
 			&p.OriginalFilename, &p.Size, &p.Width, &p.Height, &p.MimeType,
 			&takenAt, &lat, &long, &p.Caption, &createdAt,
 			&p.Uploader.ID, &p.Uploader.Name, &p.Uploader.AvatarURL,