feat: 列表添加多选下载功能，支持批量选择和下载音乐

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

@@ -126,7 +126,6 @@ const artists = computed(() => baseItem.value?.artists || []);
 // 包装方法，避免直接访问可能为undefined的ref
 const onToggleSelect = () => {
   baseItem.value?.toggleSelect();
-  emit('select', props.item.id, !props.selected);
 };
 const onArtistClick = (id: number) => baseItem.value?.handleArtistClick(id);
 const onToggleFavorite = (event: Event) => {

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

@@ -131,7 +131,6 @@ const artists = computed(() => baseItem.value?.artists || []);
 // 包装方法，避免直接访问可能为undefined的ref
 const onToggleSelect = () => {
   baseItem.value?.toggleSelect();
-  emit('select', props.item.id, !props.selected);
 };
 const onImageLoad = (event: Event) => baseItem.value?.imageLoad(event);
 const onArtistClick = (id: number) => baseItem.value?.handleArtistClick(id);