Apple-style audiobook card & modal redesign

Add Apple-style UI refinements and UX improvements across audiobooks.

- Add app icons and update manifest/layout to reference new 180x180 and 1024x1024 app icons.
- Add global CSS animations (shimmer and toast slide-in) for improved skeletons/toasts.
- Refactor AudiobookCard: new "cover-first" design, accessibility improvements, hover actions, request handling, inline toast/error UI, status helper (status -> badge/state mapping), simplified metadata layout, and polished animations/visuals. Removed some legacy imports and adjusted request UX (shorter toasts, error timing).
- Enhance AudiobookDetailsModal: mobile-first sticky header, desktop modal polish, improved status logic, toast/notification helper, ASIN copy behavior, ebook request flows, uses preferences (squareCovers) and various layout/formatting tweaks.
- Propagate hideRequestActions from bookdate page (bookdate/page.tsx).

These changes focus on visual polish, accessibility, and smoother request/notification UX. Files changed: public manifest & icons, globals.css, app/layout.tsx, bookdate page, AudiobookCard, AudiobookDetailsModal, and PreferencesContext (context usage updated).

public/manifest.json

@@ -8,15 +8,10 @@
   "theme_color": "#1e3a5f",
   "icons": [
     {
-      "src": "/RMAB_1024x1024_ICON.png",
+      "src": "/RMAB_1024x1024_APPICON.png",
       "sizes": "1024x1024",
       "type": "image/png",
       "purpose": "any maskable"
-    },
-    {
-      "src": "/rmab_32x32.png",
-      "sizes": "32x32",
-      "type": "image/png"
     }
   ]
 }