feat: 优化播放控制器中的时间格式化逻辑，移除不必要的乐观显示状态，简化代码结构

src/components/PlaybackController.vue

@@ -62,24 +62,13 @@ const formatTime = (ms: number): string => {
   return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
 };
 
-const currentTimeFormatted = computed(() => formatTime(pendingSeekTime.value ?? props.currentTime));
+const currentTimeFormatted = computed(() => formatTime(props.currentTime));
 const totalDurationFormatted = computed(() => formatTime(props.totalDuration));
 
-// 本地“乐观显示”的时间：在 seek 后先行展示，待实际时间变更后清空
-const pendingSeekTime = ref<number | null>(null);
-
-// 同步清理：当外部 currentTime 改变时，移除乐观显示
-watch(
-  () => props.currentTime,
-  () => {
-    pendingSeekTime.value = null;
-  },
-);
-
 const playheadPosition = computed(() => {
   const viewDuration = viewEndTime.value - viewStartTime.value;
   if (viewDuration <= 0) return '0%';
-  const current = pendingSeekTime.value ?? props.currentTime;
+  const current = props.currentTime;
   const relativeTime = current - viewStartTime.value;
   const clamped = Math.min(Math.max(relativeTime, 0), viewDuration);
   return `${(clamped / viewDuration) * 100}%`;
@@ -116,7 +105,6 @@ const handleHourChange = (newHour: number) => {
   const newTime = newHour * HOUR_IN_MS;
   // 确保搜寻时间不超过总时长
   const clampedTime = Math.min(newTime, props.totalDuration);
-  pendingSeekTime.value = clampedTime;
   emit('seek', clampedTime);
 };
 
@@ -140,7 +128,6 @@ const handleTimelineClick = (event: MouseEvent) => {
   const ratio = clampedX / effectiveWidth;
   const viewDuration = viewEndTime.value - viewStartTime.value;
   const targetTime = Math.floor(viewStartTime.value + ratio * viewDuration);
-  pendingSeekTime.value = targetTime;
   emit('seek', targetTime);
   // 点击发生后，立即更新所选小时，保持左侧小时选择与视窗一致
   const clickedHour = Math.floor(targetTime / HOUR_IN_MS);