feat(lesereisen): implement lesereisen

frontend/src/lib/geschichte/JourneyInterlude.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+import { m } from '$lib/paraglide/messages.js';
+
+interface Props {
+	note: string;
+}
+
+let { note }: Props = $props();
+</script>
+
+<div
+	role="note"
+	aria-label={m.journey_interlude_aria_label()}
+	class="my-4 rounded-r-sm border-l-2 border-journey-border bg-journey-tint py-2 pr-3 pl-3"
+>
+	<!-- plaintext — do NOT use {@html} here -->
+	<p class="text-base leading-relaxed text-ink italic">{note}</p>
+</div>