New Aero background (Gemini-made), old credit removed

The scene is the user's own Frutiger Aero image now: green hills, a river,
an eco-city, bubbles and daisies. Re-encoded to public/aero/background.webp
(152 kB) with a fresh 3 kB pre-blurred variant for the glass, and the
WallpaperSafari credit line, its i18n keys and the README credit are gone
(the image is made by the user with Gemini).

Contrast: 0 below-minimum findings and 0 axe violations, all three themes.
Version 0.2.8, SW -> freezmo-v60.

components/ThemeSection.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useTheme, type Theme } from "@/components/ThemeToggle";
+import { useTheme, type Theme } from "@/lib/theme";
 import { haptic } from "@/lib/haptics";
 import { useI18n } from "@/lib/i18n";
 
@@ -40,17 +40,7 @@ export function ThemeSection() {
       {theme === "aero" ? (
         <>
           <p className="text-[11px] leading-snug text-[var(--text-subtle)]">{t("theme.aeroNote")}</p>
-          <p className="text-[11px] leading-snug text-[var(--text-subtle)]">
-            {t("theme.aeroCredit")}{" "}
-            <a
-              href="https://wallpapersafari.com/w/IlWuz7"
-              target="_blank"
-              rel="noreferrer"
-              className="underline decoration-dotted"
-            >
-              wallpapersafari.com/w/IlWuz7
-            </a>
-          </p>
+
         </>
       ) : null}
     </section>