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/+page.svelte

@@ -36,14 +36,14 @@ h1{
 
 <MediaScroller title="In Saison">
 {#each data.season as recipe}
-	<Card {recipe} {current_month} loading_strat={"eager"} do_margin_right={true}></Card>
+	<Card {recipe} {current_month} loading_strat={"eager"} do_margin_right={true} isFavorite={recipe.isFavorite} showFavoriteIndicator={!!data.session?.user}></Card>
 {/each}
 </MediaScroller>
 
 {#each categories as category}
 	<MediaScroller title={category}>
 	{#each data.all_brief.filter(recipe => recipe.category == category) as recipe}
-		<Card {recipe} {current_month} do_margin_right={true}></Card>
+		<Card {recipe} {current_month} do_margin_right={true} isFavorite={recipe.isFavorite} showFavoriteIndicator={!!data.session?.user}></Card>
 	{/each}
 	</MediaScroller>
 {/each}