feat: add navigation button to notifications for direct song/album/playlist access

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

src/main.js

@@ -30,7 +30,7 @@ import {
   saveEditPlaylist, editPlUploadCover, editPlCoverSelected, editPlRemoveCover,
   deletePlaylist, _confirmOk, _confirmCancel,
   toggleMobileSearch, closeMobileSearch, switchSetupTab,
-  toggleNotifPanel, deleteNotif, clearNotifs, initNotifBell,
+  toggleNotifPanel, deleteNotif, clearNotifs, initNotifBell, _notifNavigate,
 } from './ui.js';
 
 // ─── CONNECT ───
@@ -241,7 +241,7 @@ Object.assign(window, {
   openEditPlModal, closeEditPlModal, saveEditPlaylist,
   editPlUploadCover, editPlCoverSelected, editPlRemoveCover, deletePlaylist, _confirmOk, _confirmCancel,
   toggleMobileSearch, closeMobileSearch, switchSetupTab,
-  toggleNotifPanel, deleteNotif, clearNotifs,
+  toggleNotifPanel, deleteNotif, clearNotifs, _notifNavigate,
   // App
   doConnect, disconnect,
 });