refactor: restructure src into player/views/ui subfolders; fix notification skip buttons

- Move player.js + nowplaying.js → src/player/
- Move views.js + spotify/soundcloud/youtube/abs → src/views/
- Move ui.js + components.js → src/ui/
- Update all import paths (static + lazy) across every file
- MusicService: wrap ExoPlayer in ForwardingPlayer that always advertises
  next/prev commands so the notification skip buttons stay visible in radio
  mode even when the JS queue has only one native track

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

src/main.js

@@ -10,18 +10,18 @@ import {
   toggleRadioMode, starCurrent, downloadCurrent, renderQueue, playPreview,
   toggleStar, dlSongLocal, _applyRadioBtn, _applyShuffleRepeat, _restoreLastPlayed, setPlayIcon,
   npToggleStar, updateMediaSession, updateNpColorMode, reconcileNativeState,
-} from './player.js';
+} from './player/player.js';
 import {
   navigate, _navGoBack, _navLoad, onHeaderSearch, closeHeaderSearch,
   onGlobalSearch, s_goArtist, s_goAlbum, playerBarGoArtist, playerBarGoAlbum,
   searchSimilarArtist, searchAndPreview, loadItunesAlbum, expandArtistBio,
   loadAlbums, loadStarred, loadRandom, filterStarred, filterPlaylist,
   plReorderEnter, plReorderSave, plReorderCancel, toggleAllGenres,
-} from './views.js';
+} from './views/views.js';
 import { loadSpotifyImporter, resolveSpotifyLink, clearSpotifyPreview, spotifyDlAll,
-         onImporterInput, resolveImporterLink } from './spotify.js';
-import { resolveYouTubeLink, executeYouTubeDownload } from './youtube.js';
-import { loadSoundCloudImporter, resolveSoundCloudLink, clearSoundCloudPreview, scDlAll, scDlSingle, scDlTrack } from './soundcloud.js';
+         onImporterInput, resolveImporterLink } from './views/spotify.js';
+import { resolveYouTubeLink, executeYouTubeDownload } from './views/youtube.js';
+import { loadSoundCloudImporter, resolveSoundCloudLink, clearSoundCloudPreview, scDlAll, scDlSingle, scDlTrack } from './views/soundcloud.js';
 import {
   absInitFromStorage, absOpenSettings, absConnectSettings, absSetLibrary, absDisconnect, absVerifyApiKey, absToggleConnection,
   absPlayItem, absTogglePlay, absSeek, absSkipSecs, absNextChapter, absPrevChapter,
@@ -29,11 +29,11 @@ import {
   absToggleSpeedPicker, absToggleSleepPicker, absSeekToChapter, absProgDown, absProgMove,
   absProgUp, loadAbsBooks, absOpenBook, loadAbsBookDetail, absPlayChapter,
   absLoadSettingsLibraries, absToggleChapterTrack, absInterrupt,
-} from './abs.js';
+} from './views/abs.js';
 import {
   openNowPlaying, closeNowPlaying, switchNpTab, npGoArtist, npGoAlbum,
   openNpMenu, closeNpMenu,
-} from './nowplaying.js';
+} from './player/nowplaying.js';
 import {
   openSettings, closeSettings, saveSettings, confirmDisconnect,
   checkBackend, openSidebar, closeSidebar, switchNavMode, showCtxMenu,
@@ -48,7 +48,7 @@ import {
   toggleInfoEdit, onInfoArtFile, autofillMusicBrainz, autofillItunes, saveMetadata, deleteSong,
   addRomajiOverrideUI, removeRomajiOverrideUI,
   openRomajiOverridesModal, closeRomajiOverridesModal,
-} from './ui.js';
+} from './ui/ui.js';
 
 // ─── CONNECT ───
 async function doConnect() {