Suppress auto skip for 2s after manual seek

Prevents intro/outro skip from immediately triggering when user
uses jump back, prev chapter, or seeks manually into a skip zone.

client/components/app/MediaPlayerContainer.vue

@@ -280,9 +280,11 @@ export default {
       this.playerHandler.playPause()
     },
     jumpForward() {
+      this._manualSeekTime = Date.now()
       this.playerHandler.jumpForward()
     },
     jumpBackward() {
+      this._manualSeekTime = Date.now()
       this.playerHandler.jumpBackward()
     },
     setVolume(volume) {
@@ -293,6 +295,7 @@ export default {
       this.playerHandler.setPlaybackRate(playbackRate)
     },
     seek(time) {
+      this._manualSeekTime = Date.now()
       this.playerHandler.seek(time)
     },
     playbackTimeUpdate(time) {
@@ -568,6 +571,9 @@ export default {
       if (!doSkipIntro && !doSkipOutro) return
       if (!this.isPlaying || !this.chapters.length) return
 
+      // 用户手动seek后2秒内不触发跳过
+      if (this._manualSeekTime && Date.now() - this._manualSeekTime < 2000) return
+
       // 防重入：正在跳过时等待到达目标位置后再解除
       if (this._isSkipping) {
         if (this._skipTarget != null && currentTime >= this._skipTarget - 0.5) {