refactor(format): consolidate duration formatters into format/formatDuration (Phase L, part 2) (#690)

The mm:ss track-time formatter was hand-rolled in 11 places and the
h:mm:ss total-duration formatter in 4 — extract two tested functions:

- formatTrackTime(seconds, fallback='0:00')  — m:ss, used for track /
  playback times. fallback param covers the '–' placeholder rows.
- formatLongDuration(seconds)                — h:mm:ss when >=1h, else
  m:ss, used for album / queue totals.

Behaviour preserved per call site: the unified guard
(!seconds || !isFinite || <0 -> fallback) produces identical output to
every prior variant for all real inputs; SongRow keeps its '–' via the
fallback arg. Removes the formatter exports from 6 componentHelpers
files (playerBarHelpers / fullscreenPlayerHelpers deleted — they only
exported the formatter) and 7 inline component copies.

+ formatDuration.test.ts

src/components/albumTrackList/AlbumTrackListMobile.tsx

@@ -3,7 +3,7 @@ import { AudioLines } from 'lucide-react';
 import type { SubsonicSong } from '../../api/subsonicTypes';
 import type { Track } from '../../store/playerStoreTypes';
 import { songToTrack } from '../../utils/playback/songToTrack';
-import { formatDuration } from '../../utils/componentHelpers/albumTrackListHelpers';
+import { formatLongDuration } from '../../utils/format/formatDuration';
 
 interface Props {
   discNums: number[];
@@ -71,7 +71,7 @@ export function AlbumTrackListMobile({
                   )}
                   <span className="tracklist-mobile-title">{song.title}</span>
                 </div>
-                <span className="tracklist-mobile-duration">{formatDuration(song.duration)}</span>
+                <span className="tracklist-mobile-duration">{formatLongDuration(song.duration)}</span>
               </div>
             );
           })}

src/components/albumTrackList/TrackRow.tsx

@@ -10,7 +10,8 @@ import { useSelectionStore } from '../../store/selectionStore';
 import { useThemeStore } from '../../store/themeStore';
 import { usePreviewStore } from '../../store/previewStore';
 import StarRating from '../StarRating';
-import { codecLabel, formatDuration, type ColKey } from '../../utils/componentHelpers/albumTrackListHelpers';
+import { codecLabel, type ColKey } from '../../utils/componentHelpers/albumTrackListHelpers';
+import { formatLongDuration } from '../../utils/format/formatDuration';
 
 type ContextMenuFn = (
   x: number,
@@ -173,7 +174,7 @@ export const TrackRow = React.memo(function TrackRow({
       case 'duration':
         return (
           <div key="duration" className="track-duration">
-            {formatDuration(song.duration)}
+            {formatLongDuration(song.duration)}
           </div>
         );
       case 'format':