feat(lesereisen): JourneyItemCard, JourneyInterlude, JourneyReader with XSS + omit-rule specs

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

frontend/src/lib/geschichte/JourneyInterlude.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+interface Props {
+	note: string;
+}
+
+let { note }: Props = $props();
+</script>
+
+<div
+	aria-label="Kuratorennotiz"
+	class="my-2 border-l-4 border-journey-border bg-journey-tint px-4 py-3"
+>
+	<p
+		class="text-center font-sans text-xs tracking-widest text-journey uppercase"
+		aria-hidden="true"
+	>
+		❦
+	</p>
+	<!-- plaintext — do NOT use {@html} here -->
+	<p class="font-serif text-base leading-relaxed text-ink-2 italic">{note}</p>
+</div>