Keep icon touch targets full-size; shrink logo instead; fluid nav gap

Revert the 40px icon-shrink below 375px (hard to tap accurately) and reclaim that space from the logo instead (76-130px depending on width, vs the always-181px controls). Re-verified overflow-free at 320px via Playwright with all 4 icons at full 44px.

Also: wishlist heart's touch-friendly smaller/subtler size now applies to already-wishlisted (filled) hearts too, not just not-yet-wishlisted ones. The wishlist page's login redirect now returns to the wishlist instead of the generic account/orders overview. Desktop nav-link gap now scales fluidly between 1024-1300px instead of a fixed 48px that felt too wide right where nav labels have the least room.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/konto/merkliste/page.tsx

@@ -19,7 +19,12 @@ export const metadata: Metadata = {
 
 export default async function KontoMerklistePage() {
   const session = await getSessionCustomer();
-  if (!session) redirect("/konto/login");
+  // ?redirect= back to this page — landing on the generic account/orders
+  // overview after logging in from the wishlist icon (the common entry
+  // point, unlike most other /konto/* pages that are only ever reached
+  // once already logged in) would silently lose the wishlist context the
+  // customer actually came here for.
+  if (!session) redirect("/konto/login?redirect=%2Fkonto%2Fmerkliste");
 
   // The feature can be switched off after a customer already had rows in
   // their wishlist — 404 rather than showing a stale page for a feature