feat(shopping): add RecipeReferencePanel.svelte component

Desktop right panel showing this week's recipe cards with day
abbreviation, filtered staples count, and link to edit pantry.

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

frontend/src/lib/shopping/RecipeReferencePanel.svelte

@@ -0,0 +1,62 @@
+<script lang="ts">
+	import { formatDayAbbr } from '$lib/planner/week';
+
+	interface Slot {
+		slotDate?: string;
+		recipe?: {
+			id?: string;
+			name?: string;
+		};
+	}
+
+	interface Props {
+		slots: Slot[];
+		filteredStaplesCount: number;
+	}
+
+	let { slots, filteredStaplesCount }: Props = $props();
+
+	let filledSlots = $derived(slots.filter((s) => s.recipe));
+</script>
+
+<aside class="flex flex-col gap-4">
+	<div>
+		<h2 class="font-[var(--font-sans)] text-[12px] font-medium uppercase tracking-wide text-[var(--color-text-muted)]">
+			Rezepte dieser Woche
+		</h2>
+		<div class="mt-2 space-y-1.5">
+			{#each filledSlots as slot}
+				<a
+					href="/recipes/{slot.recipe?.id}"
+					class="flex items-center gap-2 rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-page)] px-3 py-2 hover:border-[var(--green-light)]"
+				>
+					<span class="min-w-[28px] font-[var(--font-sans)] text-[11px] text-[var(--color-text-muted)]">
+						{slot.slotDate ? formatDayAbbr(slot.slotDate, 'short') : ''}
+					</span>
+					<span class="flex-1 truncate font-[var(--font-sans)] text-[13px] font-medium text-[var(--color-text)]">
+						{slot.recipe?.name}
+					</span>
+				</a>
+			{/each}
+			{#if filledSlots.length === 0}
+				<p class="font-[var(--font-sans)] text-[13px] text-[var(--color-text-muted)]">
+					Keine Gerichte geplant.
+				</p>
+			{/if}
+		</div>
+	</div>
+
+	{#if filteredStaplesCount > 0}
+		<div class="rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-page)] px-3 py-2">
+			<p class="font-[var(--font-sans)] text-[13px] text-[var(--color-text-muted)]">
+				{filteredStaplesCount} Grundzutaten automatisch ausgeblendet
+			</p>
+			<a
+				href="/pantry"
+				class="font-[var(--font-sans)] text-[12px] font-medium text-[var(--green-dark)] hover:underline"
+			>
+				Vorrat bearbeiten
+			</a>
+		</div>
+	{/if}
+</aside>