feat(recipes): add C6 day-picker flow — week plan load + slot actions + DayPicker sheet

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/recipes/RecipeGrid.svelte

@@ -2,13 +2,13 @@
 	import RecipeCard from './RecipeCard.svelte';
 	import type { RecipeSummary } from './types';
 
-	let { recipes }: { recipes: RecipeSummary[] } = $props();
+	let { recipes, onplan }: { recipes: RecipeSummary[]; onplan?: (recipeId: string, recipeName: string) => void } = $props();
 </script>
 
 {#if recipes.length > 0}
 	<div data-testid="recipe-grid" class="grid grid-cols-2 lg:grid-cols-4 gap-[8px] lg:gap-[12px] p-[16px]">
 		{#each recipes as recipe (recipe.id)}
-			<RecipeCard {recipe} compact={true} />
+			<RecipeCard {recipe} compact={true} {onplan} />
 		{/each}
 	</div>
 {:else}