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).

src/app/layout.tsx

@@ -30,7 +30,8 @@ export const metadata: Metadata = {
     ],
     shortcut: "/rmab_icon.ico",
     apple: [
-      { url: "/RMAB_1024x1024_ICON.png", sizes: "1024x1024", type: "image/png" },
+      { url: "/RMAB_180x180_APPICON.png", sizes: "180x180", type: "image/png" },
+      { url: "/RMAB_1024x1024_APPICON.png", sizes: "1024x1024", type: "image/png" },
     ],
   },
   appleWebApp: {