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/[slug]/page.tsx

@@ -76,12 +76,6 @@ export default async function DynamicPage({
                 <span>›</span>
                 <span className="text-text-primary">{page.title}</span>
               </p>
-              <p
-                className="font-semibold text-[clamp(2.25rem,1.393rem+1.786vw,3rem)] text-text-primary leading-[1.15]"
-                style={{ fontFamily: "var(--font-playfair)" }}
-              >
-                {page.title}
-              </p>
             </Reveal>
 
             <Reveal delay={0.1} className="w-full max-w-[48rem] mx-auto px-[var(--layout-padding-x)] pb-14 flex flex-col gap-5">