feat(headline): optionaler SectionHeader-Modus (kicker/number/action)

HeadlineBlock rendert als SectionHeader sobald kicker oder action gesetzt ist,
sonst schlichte Text-Headline wie bisher (rückwärtskompatibel, opt-in).
SectionHeader-Titel unterstützt jetzt \n → <br>. headline-Schema extends
section_header.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/block-types.ts

@@ -45,6 +45,12 @@ export interface HeadlineBlockData {
   _slug?: string;
   tag?: "h1" | "h2" | "h3" | "h4" | "h5" | "h6";
   text?: string;
+  /** SectionHeader: Label über dem Titel (uppercase). Gesetzt → Headline rendert als Sektionskopf. */
+  kicker?: string;
+  /** SectionHeader: Index vor dem Kicker, z.B. "03". */
+  number?: string;
+  /** SectionHeader: CTA-Link (aufgelöst: url, linkName). */
+  action?: string | { url?: string; linkName?: string; newTab?: boolean };
   align?: "left" | "center" | "right";
   layout?: BlockLayout;
 }

src/lib/components/SectionHeader.svelte

@@ -51,9 +51,9 @@
       </div>
     {/if}
 
-    <!-- Titel -->
+    <!-- Titel (\n → harter Umbruch, wie HeadlineBlock) -->
     <svelte:element this={tag} class="text-3xl font-bold tracking-[-0.02em] text-stein-800 lg:text-[34px]">
-      {title}
+      {#each title.split('\n') as line, i}{#if i > 0}<br />{/if}{line}{/each}
     </svelte:element>
 
     {#if subtitle}

src/lib/components/blocks/HeadlineBlock.stories.ts

@@ -36,3 +36,15 @@ export const MitUmbruch: Story = {
     },
   },
 };
+
+// Sobald kicker/action gesetzt → Headline rendert als SectionHeader.
+export const AlsSektionskopf: Story = {
+  args: {
+    block: {
+      tag: 'h2',
+      text: 'Wir sind keine Lobby,\nkeine Partei, keine NGO.',
+      kicker: 'Über uns',
+      action: { url: '/about', linkName: 'Mehr über uns' },
+    },
+  },
+};

src/lib/components/blocks/HeadlineBlock.svelte

@@ -1,10 +1,21 @@
 <script lang="ts">
   import { getBlockLayoutClasses } from "$lib/block-layout";
+  import SectionHeader from "$lib/components/SectionHeader.svelte";
   import type { HeadlineBlockData } from "$lib/block-types";
 
   let { block }: { block: HeadlineBlockData } = $props();
 
   const layoutClasses = $derived(getBlockLayoutClasses(block.layout));
+  // Sektionskopf-Modus: sobald kicker ODER action gesetzt ist, rendert die
+  // Headline als SectionHeader. Sonst schlichte Text-Headline wie bisher.
+  const actionRef = $derived(
+    block.action && typeof block.action === "object" ? block.action : null,
+  );
+  const useSection = $derived(!!block.kicker || !!actionRef);
+  // SectionHeader kennt nur h1–h3; h4–h6 → h2.
+  const sectionTag = $derived(
+    block.tag === "h1" || block.tag === "h2" || block.tag === "h3" ? block.tag : "h2",
+  );
   const alignClass = $derived(
     block.align === "center"
       ? "text-center"
@@ -20,10 +31,21 @@
 </script>
 
 <div class={layoutClasses} data-block="Headline" data-block-type="headline" data-block-slug={block._slug}>
-  <svelte:element
-    this={Tag}
-    class={alignClass}
-  >
-    {#each lines as line, i}{#if i > 0}<br />{/if}{line}{/each}
-  </svelte:element>
+  {#if useSection}
+    <SectionHeader
+      number={block.number}
+      kicker={block.kicker}
+      title={block.text ?? ""}
+      tag={sectionTag}
+      actionLabel={actionRef?.linkName}
+      actionHref={actionRef?.url}
+    />
+  {:else}
+    <svelte:element
+      this={Tag}
+      class={alignClass}
+    >
+      {#each lines as line, i}{#if i > 0}<br />{/if}{line}{/each}
+    </svelte:element>
+  {/if}
 </div>