feat(recipes): add StepList component with numbered circles

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

frontend/src/lib/recipes/StepList.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+	type Step = { stepNumber?: number; instruction?: string };
+
+	let { steps }: { steps: Step[] } = $props();
+
+	const sortedSteps = $derived(
+		[...steps].sort((a, b) => (a.stepNumber ?? 0) - (b.stepNumber ?? 0))
+	);
+</script>
+
+<section>
+	<h2
+		class="text-[12px] font-medium font-sans tracking-[0.08em] uppercase text-[var(--color-text-muted)] mb-[16px]"
+	>
+		Zubereitung
+	</h2>
+	<ol>
+		{#each sortedSteps as step (step.stepNumber)}
+			<li class="flex gap-[16px] items-start mb-[20px]">
+				<div
+					data-testid="step-circle"
+					class="w-[28px] h-[28px] rounded-full bg-[var(--green-dark)] text-white flex items-center justify-center shrink-0 font-sans text-[13px] font-medium"
+				>
+					{step.stepNumber}
+				</div>
+				<p class="text-[14px] text-[var(--color-text)] leading-[1.6] pt-[4px]">
+					{step.instruction}
+				</p>
+			</li>
+		{/each}
+	</ol>
+</section>