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/queuePanel/QueueList.tsx

@@ -5,7 +5,7 @@ import OverlayScrollArea from '../OverlayScrollArea';
 import { usePlayerStore } from '../../store/playerStore';
 import { useLuckyMixStore } from '../../store/luckyMixStore';
 import type { Track, PlayerState } from '../../store/playerStoreTypes';
-import { formatTime } from '../../utils/componentHelpers/queuePanelHelpers';
+import { formatTrackTime } from '../../utils/format/formatDuration';
 
 type StartDrag = (
   payload: { data: string; label: string },
@@ -125,7 +125,7 @@ export function QueueList({
                 })()}
               </div>
               <div className="queue-item-duration">
-                {formatTime(track.duration)}
+                {formatTrackTime(track.duration)}
               </div>
             </div>
             {luckyRolling && isPlaying && (