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/routes/rezepte/season/+page.server.ts

@@ -0,0 +1,19 @@
+import type { PageServerLoad } from "./$types";
+import { getUserFavorites, addFavoriteStatusToRecipes } from "$lib/server/favorites";
+
+export const load: PageServerLoad = async ({ fetch, locals }) => {
+    let current_month = new Date().getMonth() + 1
+    const res_season = await fetch(`/api/rezepte/items/in_season/` + current_month);
+    const item_season = await res_season.json();
+    
+    // Get user favorites and session
+    const [userFavorites, session] = await Promise.all([
+        getUserFavorites(fetch, locals),
+        locals.auth()
+    ]);
+    
+    return {
+        season: addFavoriteStatusToRecipes(item_season, userFavorites),
+        session
+    };
+};