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/zh.ts

@@ -1108,6 +1108,24 @@ export const zhTranslation = {
     prev: '上一首',
     play: '播放',
     pause: '暂停',
+    delayModalTitle: '定时',
+    delayPauseSection: '多久后暂停',
+    delayStartSection: '多久后开始',
+    delaySchedulePause: '安排暂停',
+    delayScheduleStart: '安排开始',
+    delayCancelPause: '取消暂停定时',
+    delayCancelStart: '取消开始定时',
+    delayInactivePause: '仅在正在播放时可用。',
+    delayInactiveStart: '仅在暂停且已加载曲目或电台时可用。',
+    delayCustomMinutes: '自定义延迟（分钟）',
+    delayCustomPlaceholder: '例如 2.5',
+    closeDelayModal: '关闭',
+    delayIn: '还有',
+    delayFmtSec: '{{n}} 秒',
+    delayFmtMin: '{{n}} 分钟',
+    delayFmtHr: '{{n}} 小时',
+    delayCancel: '取消',
+    delayApply: '应用',
     next: '下一首',
     repeat: '重复',
     repeatOff: '关闭',