Match the profile icon's size to the cart icon in the navbar

Profile was h-6 w-6 (24px) next to cart's h-7 w-7 (28px), a noticeable
size mismatch between the two always-visible nav icons.

app/components/Navbar.tsx

@@ -113,7 +113,7 @@ function AccountLink() {
       aria-label={loggedIn ? "Mein Konto (eingeloggt)" : "Anmelden"}
       className="relative flex h-11 w-11 items-center justify-center shrink-0 active:scale-[0.9] transition-transform"
     >
-      <svg viewBox="0 0 24 24" className="h-6 w-6 text-text-primary" fill="none" aria-hidden="true">
+      <svg viewBox="0 0 24 24" className="h-7 w-7 text-text-primary" fill="none" aria-hidden="true">
         <circle cx="12" cy="8" r="3.6" stroke="currentColor" strokeWidth="1.8" />
         <path d="M4.5 20c1.2-4 4-6 7.5-6s6.3 2 7.5 6" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" />
       </svg>