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/store/slices/player.ts

@@ -11,7 +11,6 @@ export interface PlayerState {
   muted: boolean;
   repeat: RepeatMode;
   shuffle: boolean;
-  isNowPlayingOpen: boolean;
   isQueueOpen: boolean;
 }
 
@@ -24,7 +23,6 @@ export const playerInitialState: PlayerState = {
   muted: false,
   repeat: 'none',
   shuffle: false,
-  isNowPlayingOpen: false,
   isQueueOpen: false,
 };
 
@@ -66,9 +64,6 @@ export const playerSlice = createSlice({
     toggleShuffle(state) {
       state.shuffle = !state.shuffle;
     },
-    toggleNowPlaying(state) {
-      state.isNowPlayingOpen = !state.isNowPlayingOpen;
-    },
     toggleQueue(state) {
       state.isQueueOpen = !state.isQueueOpen;
     },
@@ -86,7 +81,6 @@ export const {
   toggleMute,
   setRepeat,
   toggleShuffle,
-  toggleNowPlaying,
   toggleQueue,
 } = playerSlice.actions;
 export default playerSlice.reducer;

src/store/slices/ui.ts

@@ -4,12 +4,15 @@ interface UiState {
   sidebarCollapsed: boolean;
   activeModal: string | null;
   activeTrackContextMenuId: string | null;
+  /** Track whose info drawer is open (rightmost drawer); null = closed. */
+  trackInfoId: string | null;
 }
 
 const initialState: UiState = {
   sidebarCollapsed: false,
   activeModal: null,
   activeTrackContextMenuId: null,
+  trackInfoId: null,
 };
 
 export const uiSlice = createSlice({
@@ -31,6 +34,12 @@ export const uiSlice = createSlice({
     setActiveContextMenu(state, action: PayloadAction<string | null>) {
       state.activeTrackContextMenuId = action.payload;
     },
+    openTrackInfo(state, action: PayloadAction<string>) {
+      state.trackInfoId = action.payload;
+    },
+    closeTrackInfo(state) {
+      state.trackInfoId = null;
+    },
   },
 });
 
@@ -40,5 +49,7 @@ export const {
   openModal,
   closeModal,
   setActiveContextMenu,
+  openTrackInfo,
+  closeTrackInfo,
 } = uiSlice.actions;
 export default uiSlice.reducer;