Fix legal-page autolink color, add Blog breadcrumb, revert breadcrumb color

- RichText.tsx: Lexical's auto-detected "autolink" nodes (a typed-out
  email/URL, as opposed to an editor-inserted link) fell through to
  Payload's unstyled default converter — only "link" was overridden.
  AGB's Vertragspartner email rendered as plain black text because of
  this. Both node types now get the same text-brand/hover:underline
  treatment.
- Breadcrumb color revert: the breadcrumb Startseite links across the
  4 legal pages/shop should stay their original hover:text-brand
  treatment — only the actual content/contact links needed the
  always-brand-colored style, not page-level breadcrumbs.
- /blog was the one page missing both a breadcrumb and the
  text-h-feature heading size every other section page (/shop, legal
  pages) already uses — added to match.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018unaXmuzVA8ct1b6WoyP1U

app/blog/page.tsx

@@ -66,8 +66,18 @@ export default async function BlogOverviewPage({
             hero-fade-left/hero-fade-bottom overlays (node 4577:330). */}
         <Reveal className="relative flex flex-col sm:flex-row items-center w-full min-h-[20rem] sm:min-h-[27.5rem] border-b border-border overflow-hidden">
           <div className="relative z-10 flex flex-col gap-4 items-start px-[var(--layout-padding-x)] py-10 sm:py-0 w-full sm:w-auto sm:max-w-[26rem]">
+            {/* Breadcrumb + text-h-feature heading — same treatment as
+                /shop's ShopHeader.tsx and every legal page, this hero was
+                the one page missing both (its own bespoke photo-bleed
+                layout predates that convention being established
+                elsewhere). */}
+            <p className="flex items-center gap-2 text-body-sm text-text-muted">
+              <Link href="/" className="hover:text-brand transition-colors">Startseite</Link>
+              <span>›</span>
+              <span className="text-text-primary">Blog</span>
+            </p>
             <p
-              className="font-semibold text-display text-text-primary"
+              className="font-semibold text-h-feature text-text-primary"
               style={{ fontFamily: "var(--font-lora)" }}
             >
               Blog