feat: track info drawer (Get Info-style)

Add a right-side track info drawer that sits to the right of the queue
panel when both are open. Shows a large cover, title/artist/album links,
a Play/Queue/Edit actions row, and Status/General/File/Identifiers
sections (empty rows omitted). Opens from the track context menu, the
player now-playing tile, and the queue now-playing card.

- ui slice: trackInfoId + open/closeTrackInfo
- TrackInfoDrawer rendered after QueuePanel in AppShell; overlays content
  on narrow viewports
- map source/createdAt/enrichedAt from the wire (were unmapped)
- formatDateTime helper, info icon, i18n (en/ru)
- drop orphaned toggleNowPlaying/isNowPlayingOpen from player slice

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/i18n/locales/en.ts

@@ -156,12 +156,49 @@ const en = {
       playNow: 'Play now',
       playNext: 'Play next',
       addToQueue: 'Add to queue',
+      info: 'Track info',
       addToPlaylist: 'Add to playlist…',
       editMetadata: 'Edit metadata',
       download: 'Download',
       delete: 'Delete',
     },
   },
+  trackInfo: {
+    title: 'Track info',
+    open: 'View track info',
+    close: 'Close',
+    notFound: 'Track not found',
+    play: 'Play',
+    addToQueue: 'Queue',
+    editMetadata: 'Edit metadata',
+    liked: 'Liked',
+    trackOf: 'No. {{n}} of {{total}}',
+    kbps: '{{n}} kbps',
+    sections: {
+      status: 'Status',
+      general: 'General',
+      file: 'File',
+      identifiers: 'Identifiers',
+    },
+    fields: {
+      artist: 'Artist',
+      album: 'Album',
+      trackNumber: 'Track',
+      disc: 'Disc',
+      year: 'Year',
+      genre: 'Genre',
+      duration: 'Duration',
+      format: 'Format',
+      bitrate: 'Bitrate',
+      size: 'Size',
+      source: 'Source',
+      added: 'Added',
+      enriched: 'Enriched',
+      trackId: 'Track ID',
+      albumId: 'Album ID',
+      artistId: 'Artist ID',
+    },
+  },
   common: {
     error: 'Something went wrong',
     retry: 'Retry',