fix(player): 双击歌曲时同步设置播放列表上下文

BaseSongItem 双击和右键菜单"播放"只调了 setPlay，未 emit 'play'，
导致父组件 setPlayList 不会执行，上下一首切换失效。抽出统一入口
先 emit 再触发播放，与点击播放按钮行为对齐。

src/renderer/components/common/songItemCom/BaseSongItem.vue

@@ -4,7 +4,7 @@
     @contextmenu.prevent="handleContextMenu"
     @mouseenter="handleMouseEnter"
     @mouseleave="handleMouseLeave"
-    @dblclick.stop="playMusicEvent(item)"
+    @dblclick.stop="handlePlay(item)"
   >
     <slot name="index"></slot>
     <slot name="select" v-if="selectable"></slot>
@@ -22,7 +22,7 @@
       :is-dislike="isDislike"
       :can-remove="canRemove"
       @update:show="showDropdown = $event"
-      @play="playMusicEvent(item)"
+      @play="handlePlay(item)"
       @play-next="handlePlayNext"
       @download="downloadMusic(item)"
       @download-lyric="downloadLyric(item)"
@@ -83,6 +83,12 @@ const imageLoad = async (event: Event) => {
   await handleImageLoad(target);
 };
 
+// 双击和右键菜单"播放"统一入口：先通知父组件设置播放列表上下文，再触发播放
+const handlePlay = (song: SongResult) => {
+  emits('play', song);
+  playMusicEvent(song);
+};
+
 // 切换选择状态
 const toggleSelect = () => {
   emits('select', props.item.id, !props.selected);