Fix cart-badge false pulse, blog hero-card misattribution, legal breadcrumb color

- Cart badge pulsed on every page load/reload, not just real cart
  changes — useCartCount's SSR snapshot is always 0, so hydration alone
  satisfied the "count increased" check. Skip the very first effect run.
- WishlistButton: touch-device smaller/subtler sizing now applies
  regardless of revealOnHover (e.g. the homepage spotlight heart), not
  just the shop grid's hover-reveal mode.
- /blog: the big featured-style hero card was applied to whatever post
  sorted first post-filter, even when that post isn't actually the
  `featured` one (a category filter can exclude the real featured post
  entirely). Now gated on the post's own `featured` flag.
- Legal pages' "Startseite" breadcrumb link now matches the same
  text-brand/hover:underline treatment already used elsewhere on these
  pages (e.g. Impressum's Anbieter email link), instead of staying muted
  until hover.

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

app/impressum/page.tsx

@@ -29,7 +29,7 @@ export default async function ImpressumPage() {
       <main className="flex flex-col flex-1 bg-bg-base">
         <Reveal className="flex flex-col gap-3 items-start pb-6 pt-10 px-[var(--layout-padding-x)] w-full">
           <p className="flex items-center gap-2 text-body-sm text-text-muted">
-            <Link href="/" className="hover:text-brand transition-colors">Startseite</Link>
+            <Link href="/" className="text-brand hover:underline">Startseite</Link>
             <span>›</span>
             <span className="text-text-primary">Impressum</span>
           </p>