feat(lyrics): animate pronunciation and translation visibility

Add a contextual language menu for available lyric supplements in portrait and landscape. Remember independent visibility choices across tracks and player sessions without changing embedded lyrics or download options.

Fade and collapse supplements over 320 ms while interpolating lyric row heights and keeping the active line aligned. Honor reduced motion and control auto-hide; cover menu availability, persistence, animation, and word timing in widget tests.

lib/l10n/arb/app_en.arb

@@ -6348,6 +6348,14 @@
     "description": "Tab label for the lyrics view"
   },
   "nowPlayingNoLyrics": "No lyrics in this file",
+  "nowPlayingLyricsLanguageOptions": "Lyrics language options",
+  "@nowPlayingLyricsLanguageOptions": {
+    "description": "Tooltip for the player menu that shows or hides existing lyric pronunciation and translation"
+  },
+  "nowPlayingHidePronunciation": "Hide Pronunciation",
+  "nowPlayingShowPronunciation": "Show Pronunciation",
+  "nowPlayingHideTranslation": "Hide Translation",
+  "nowPlayingShowTranslation": "Show Translation",
   "@nowPlayingNoLyrics": {
     "description": "Empty state when the playing file has no embedded lyrics"
   },

lib/l10n/arb/app_id.arb

@@ -5688,6 +5688,11 @@
   "setupStorageGranted": "Izin Penyimpanan Diberikan!",
   "downloadAllowLocalNetwork": "Allow Local Network Access",
   "nowPlayingNoLyrics": "No lyrics in this file",
+  "nowPlayingLyricsLanguageOptions": "Opsi bahasa lirik",
+  "nowPlayingHidePronunciation": "Sembunyikan Pelafalan",
+  "nowPlayingShowPronunciation": "Tampilkan Pelafalan",
+  "nowPlayingHideTranslation": "Sembunyikan Terjemahan",
+  "nowPlayingShowTranslation": "Tampilkan Terjemahan",
   "selectionDeleteTracksCount": "Delete {count} {count, plural, =1{track} other{tracks}}",
   "@selectionDeleteTracksCount": {
     "description": "Button label for deleting selected tracks",