feat: complete YouTube-style site experience for YMB

- rebuild home feed with sticky server-driven categories and skeletons
- add full-screen shorts feed with likes, comments, saves and follows
- rebuild watch page with same-drama episode swiping and locked states
- wire search, watch history and episode stats to the app API
- add about page with app store links and an upload video dialog
- add SVG language flags, formatted view counts and site icons

src/app/App.jsx

@@ -7,5 +7,7 @@ import { ListingPage } from '../pages/ListingPage';
 import { SearchPage } from '../pages/SearchPage';
 import { WatchPage } from '../pages/WatchPage';
 import { ShortsFeedPage } from '../pages/ShortsFeedPage';
+import { HistoryPage } from '../pages/HistoryPage';
+import { AboutPage } from '../pages/AboutPage';
 
-export function App() { return <BrowserRouter><StoreProvider><Routes><Route element={<AppShell />}><Route path="/" element={<HomePage />} /><Route path="/shorts" element={<ShortsFeedPage />} /><Route path="/subscriptions" element={<ListingPage type="subscriptions" />} /><Route path="/library" element={<ListingPage type="library" />} /><Route path="/history" element={<ListingPage type="history" />} /><Route path="/search" element={<SearchPage />} /><Route path="/watch/:id" element={<WatchPage />} /></Route></Routes></StoreProvider></BrowserRouter>; }
+export function App() { return <BrowserRouter><StoreProvider><Routes><Route element={<AppShell />}><Route path="/" element={<HomePage />} /><Route path="/shorts" element={<ShortsFeedPage />} /><Route path="/subscriptions" element={<ListingPage type="subscriptions" />} /><Route path="/library" element={<ListingPage type="library" />} /><Route path="/history" element={<HistoryPage />} /><Route path="/about" element={<AboutPage />} /><Route path="/search" element={<SearchPage />} /><Route path="/watch/:id" element={<WatchPage />} /></Route></Routes></StoreProvider></BrowserRouter>; }