feat(player): sleep timer and delayed start via long-press on play/pause (#270)

Add scheduled pause and resume timers in the player store, cleared on stop
and track changes. Long-press opens a compact preset modal anchored above
the transport row; one-tap presets plus custom minutes. Portaled countdown
badge on the play button; clear the long-press click guard when the modal
closes so the first play/pause click works after scheduling.

src/locales/en.ts

@@ -1128,6 +1128,24 @@ export const enTranslation = {
     prev: 'Previous Track',
     play: 'Play',
     pause: 'Pause',
+    delayModalTitle: 'Timer',
+    delayPauseSection: 'Pause after',
+    delayStartSection: 'Start after',
+    delaySchedulePause: 'Schedule pause',
+    delayScheduleStart: 'Schedule start',
+    delayCancelPause: 'Cancel pause timer',
+    delayCancelStart: 'Cancel start timer',
+    delayInactivePause: 'Available only while something is playing.',
+    delayInactiveStart: 'Available when paused with a track or radio loaded.',
+    delayCustomMinutes: 'Custom delay (minutes)',
+    delayCustomPlaceholder: 'e.g. 2.5',
+    closeDelayModal: 'Close',
+    delayIn: 'in',
+    delayFmtSec: '{{n}}s',
+    delayFmtMin: '{{n}} min',
+    delayFmtHr: '{{n}} h',
+    delayCancel: 'Cancel',
+    delayApply: 'Apply',
     next: 'Next Track',
     repeat: 'Repeat',
     repeatOff: 'Off',