fix: mark favorites with isFavorite flag to prevent filter from hiding them

src/routes/[recipeLang=recipeLang]/favorites/+page.server.ts

@@ -21,8 +21,14 @@ export const load: PageServerLoad = async ({ fetch, locals, params }) => {
 
         const favorites = await res.json();
 
+        // Mark all favorites with isFavorite flag for filter compatibility
+        const favoritesWithFlag = favorites.map(recipe => ({
+            ...recipe,
+            isFavorite: true
+        }));
+
         return {
-            favorites,
+            favorites: favoritesWithFlag,
             session
         };
     } catch (e) {