Fix account-nav feedback, blog filter position, and small icon polish

- Remove Merkliste from AccountNav — the Navbar's own wishlist icon already covers it, a second nav entry was redundant.
- Fix duplicate "Mein Profil" heading (ProfileForm already renders its own; KontoShell no longer adds a second one).
- "Eingeloggt als ..." now renders once in KontoShell, consistently on every /konto/* page, instead of only on the orders page.
- Blog category filter chips moved into the hero's own text column (was a separate bar below the entire hero including the photo) — visible immediately on every width instead of requiring a scroll past the hero image first.
- ArrowRightIcon's arrowhead wings shortened (looked like a generic oversized chevron at full length).
- Search overlay's "Esc" text button replaced with an X icon; the actual Escape keyboard shortcut is unchanged.

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

app/components/ArrowRightIcon.tsx

@@ -8,10 +8,14 @@
 // devices. An SVG has no font-fallback path — it renders identically
 // everywhere. `currentColor` stroke follows the parent Link's own
 // text/hover color, same as every other icon in this codebase.
+// Arrowhead wings are deliberately short relative to the shaft (4.2 units
+// vs. a 14-unit shaft) — the first version used full-length 45° wings
+// (7 units), which read as a generic, oversized chevron next to the small
+// bold label text it sits beside.
 export function ArrowRightIcon() {
   return (
     <svg aria-hidden width="16" height="12" viewBox="0 0 16 12" fill="none" className="shrink-0">
-      <path d="M1 6H15M15 6L10 1M15 6L10 11" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" />
+      <path d="M1 6H15M15 6L12 3M15 6L12 9" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" />
     </svg>
   );
 }