feat: v1.24.0 — Playlist Management, native sample rate playback

- Full playlist feature: overview grid, detail page with hero collage,
  tracklist DnD, song search, suggestions, context menu submenu
- Audio: disable all app-level resampling — every track plays at its
  native sample rate (target_rate always 0 in audio_play + chain_next)
- Fix: playlist hero bg flicker (memoize buildCoverArtUrl calls)
- Fix: input focus double-border (search-input → .input class)
- Polish: redesigned playlist search panel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.tsx

@@ -26,6 +26,8 @@ import Help from './pages/Help';
 import RandomAlbums from './pages/RandomAlbums';
 import SearchResults from './pages/SearchResults';
 import AdvancedSearch from './pages/AdvancedSearch';
+import Playlists from './pages/Playlists';
+import PlaylistDetail from './pages/PlaylistDetail';
 import NowPlayingPage from './pages/NowPlaying';
 import FullscreenPlayer from './components/FullscreenPlayer';
 import ContextMenu from './components/ContextMenu';
@@ -251,6 +253,8 @@ function AppShell() {
             <Route path="/offline" element={<OfflineLibrary />} />
             <Route path="/genres" element={<Genres />} />
             <Route path="/genres/:name" element={<GenreDetail />} />
+            <Route path="/playlists" element={<Playlists />} />
+            <Route path="/playlists/:id" element={<PlaylistDetail />} />
           </Routes>
         </div>
       </main>