Frontend support for the Hero block; H1 moves out of the hardcoded wrapper

app/[slug]/page.tsx and LivePageContent.tsx no longer render a
hardcoded H1 from page.title — that's now the Hero block's job (see
HeroBlock.ts's own comment on why). Breadcrumb stays, still built
from page.title.

Also backfilled /lebensuhr's already-migrated Pages document with a
Hero block (order 0) carrying its real headline — without it the
page would have lost its H1 entirely once the hardcoded wrapper was
removed.

app/lib/payload.ts

@@ -1293,6 +1293,7 @@ export async function getTrackingCodes(): Promise<TrackingCode[]> {
 // full page section, not an inline prose element.
 
 export type PageBlock =
+  | { blockType: "hero"; id: string; headline: string; subline: string | null; ctaLabel: string | null; ctaHref: string | null }
   | { blockType: "richTextSection"; id: string; content: unknown }
   | { blockType: "stepRow"; id: string; items: { id: string; icon: string; title: string; subtitle: string | null; description: string }[] }
   | { blockType: "quote"; id: string; text: string; label: string | null }
@@ -1317,6 +1318,7 @@ export type Page = {
 type PayloadPageImageField = { url?: string | null } | number | null;
 
 type PayloadPageBlock =
+  | { blockType: "hero"; id: string; headline: string; subline?: string | null; ctaLabel?: string | null; ctaHref?: string | null }
   | { blockType: "richTextSection"; id: string; content: unknown }
   | { blockType: "stepRow"; id: string; items: { id: string; icon: string; title: string; subtitle?: string | null; description: string }[] }
   | { blockType: "quote"; id: string; text: string; label?: string | null }
@@ -1358,6 +1360,15 @@ function mapPayloadPageBlock(block: PayloadPageBlock): PageBlock {
         id: block.id,
         items: block.items.map((item) => ({ ...item, subtitle: item.subtitle ?? null })),
       };
+    case "hero":
+      return {
+        blockType: "hero",
+        id: block.id,
+        headline: block.headline,
+        subline: block.subline ?? null,
+        ctaLabel: block.ctaLabel ?? null,
+        ctaHref: block.ctaHref ?? null,
+      };
     default:
       return block;
   }