feat: v1.30.0 — Discord RPC, offline bulk download, artist images, lazy loading, crossfade fix

- Discord Rich Presence (opt-in) — requested by @Bewenben (#49)
- Bulk offline download for playlists and artist discographies — requested by @Apollosport (#54)
- Offline Library filter tabs: All / Albums / Playlists / Discographies with artist grouping
- Artist images on Artists overview (opt-in, off by default) — reported by @Apollosport (#53)
- Image lazy loading via IntersectionObserver (300px margin) across all pages
- Fix: crossfade no longer triggers on manual track skip — reported by @netherguy4 (#35)
- Fix: playlist offline cache now stored as single entry (not per-album)
- Fix: image cache AbortController no longer blocks IDB writes
- Update toast: experimental auto-update hint + GH download link always visible (Win/Mac)
- Queue tech strip: genre removed
- Facebook theme: contrast, opaque badge/back button, queue tab labels
- "Save discography offline" label (was "Download discography")
- Fix: clearing empty playlists via updatePlaylist.view (Axios empty array workaround)
- starredOverrides propagated to AlbumDetail, Favorites, RandomMix

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

src/store/authStore.ts

@@ -34,7 +34,9 @@ interface AuthState {
   crossfadeSecs: number;
   gaplessEnabled: boolean;
   infiniteQueueEnabled: boolean;
+  showArtistImages: boolean;
   minimizeToTray: boolean;
+  discordRichPresence: boolean;
   nowPlayingEnabled: boolean;
   showChangelogOnUpdate: boolean;
   lastSeenChangelogVersion: string;
@@ -68,7 +70,9 @@ interface AuthState {
   setCrossfadeSecs: (v: number) => void;
   setGaplessEnabled: (v: boolean) => void;
   setInfiniteQueueEnabled: (v: boolean) => void;
+  setShowArtistImages: (v: boolean) => void;
   setMinimizeToTray: (v: boolean) => void;
+  setDiscordRichPresence: (v: boolean) => void;
   setNowPlayingEnabled: (v: boolean) => void;
   setShowChangelogOnUpdate: (v: boolean) => void;
   setLastSeenChangelogVersion: (v: string) => void;
@@ -103,7 +107,9 @@ export const useAuthStore = create<AuthState>()(
       crossfadeSecs: 3,
       gaplessEnabled: false,
       infiniteQueueEnabled: false,
+      showArtistImages: false,
       minimizeToTray: false,
+      discordRichPresence: false,
       nowPlayingEnabled: false,
       showChangelogOnUpdate: true,
       lastSeenChangelogVersion: '',
@@ -170,7 +176,9 @@ export const useAuthStore = create<AuthState>()(
       setCrossfadeSecs: (v) => set({ crossfadeSecs: v }),
       setGaplessEnabled: (v) => set({ gaplessEnabled: v }),
       setInfiniteQueueEnabled: (v) => set({ infiniteQueueEnabled: v }),
+      setShowArtistImages: (v) => set({ showArtistImages: v }),
       setMinimizeToTray: (v) => set({ minimizeToTray: v }),
+      setDiscordRichPresence: (v) => set({ discordRichPresence: v }),
       setNowPlayingEnabled: (v) => set({ nowPlayingEnabled: v }),
       setShowChangelogOnUpdate: (v) => set({ showChangelogOnUpdate: v }),
       setLastSeenChangelogVersion: (v) => set({ lastSeenChangelogVersion: v }),