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/pages/Settings.tsx

@@ -1008,6 +1008,28 @@ export default function Settings() {
                 </label>
               </div>
               <div className="settings-section-divider" />
+              <div className="settings-toggle-row">
+                <div>
+                  <div style={{ fontWeight: 500 }}>{t('settings.showArtistImages')}</div>
+                  <div style={{ fontSize: 12, color: 'var(--text-muted)' }}>{t('settings.showArtistImagesDesc')}</div>
+                </div>
+                <label className="toggle-switch" aria-label={t('settings.showArtistImages')}>
+                  <input type="checkbox" checked={auth.showArtistImages} onChange={e => auth.setShowArtistImages(e.target.checked)} />
+                  <span className="toggle-track" />
+                </label>
+              </div>
+              <div className="settings-section-divider" />
+              <div className="settings-toggle-row">
+                <div>
+                  <div style={{ fontWeight: 500 }}>{t('settings.discordRichPresence')}</div>
+                  <div style={{ fontSize: 12, color: 'var(--text-muted)' }}>{t('settings.discordRichPresenceDesc')}</div>
+                </div>
+                <label className="toggle-switch" aria-label={t('settings.discordRichPresence')}>
+                  <input type="checkbox" checked={auth.discordRichPresence} onChange={e => auth.setDiscordRichPresence(e.target.checked)} />
+                  <span className="toggle-track" />
+                </label>
+              </div>
+              <div className="settings-section-divider" />
               <div className="settings-toggle-row">
                 <div>
                   <div style={{ fontWeight: 500 }}>{t('settings.nowPlayingEnabled')}</div>