Add favorite indicators to recipe cards and improve favorites UI

- Add heart emoji indicators to recipe cards (top-left positioning)
- Show favorites across all recipe list pages (season, category, icon, tag)
- Create favorites utility functions for server-side data merging
- Convert client-side load files to server-side for session access
- Redesign favorite button with emoji hearts (🖤/❤️) and bottom-right positioning
- Fix randomizer array mutation issue causing card display glitches
- Implement consistent favorite indicators with drop shadows for visibility

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

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

src/lib/server/favorites.ts

@@ -0,0 +1,48 @@
+/**
+ * Utility functions for handling user favorites on the server side
+ */
+
+export async function getUserFavorites(fetch: any, locals: any): Promise<string[]> {
+    const session = await locals.auth();
+    
+    if (!session?.user?.nickname) {
+        return [];
+    }
+    
+    try {
+        const favRes = await fetch('/api/rezepte/favorites');
+        if (favRes.ok) {
+            const favData = await favRes.json();
+            return favData.favorites || [];
+        }
+    } catch (e) {
+        // Silently fail if favorites can't be loaded
+        console.error('Error loading user favorites:', e);
+    }
+    
+    return [];
+}
+
+export function addFavoriteStatusToRecipes(recipes: any[], userFavorites: string[]): any[] {
+    return recipes.map(recipe => ({
+        ...recipe,
+        isFavorite: userFavorites.some(favId => favId.toString() === recipe._id.toString())
+    }));
+}
+
+export async function loadRecipesWithFavorites(
+    fetch: any, 
+    locals: any, 
+    recipeLoader: () => Promise<any>
+): Promise<{ recipes: any[], session: any }> {
+    const [recipes, userFavorites, session] = await Promise.all([
+        recipeLoader(),
+        getUserFavorites(fetch, locals),
+        locals.auth()
+    ]);
+    
+    return {
+        recipes: addFavoriteStatusToRecipes(recipes, userFavorites),
+        session
+    };
+}