fix(playlist): 歌单增删歌曲后刷新用户歌单列表

添加/删除成功后调用 initializePlaylist 重新拉取，用户页与详情页的
歌曲总数(trackCount)会话内即时更新；重启后仍滞后属网易服务端缓存，
客户端无法根治。

Closes #508

src/renderer/components/common/PlaylistDrawer.vue

@@ -235,6 +235,8 @@ const handleAddToPlaylist = async (playlist: any) => {
     if (res.status === 200) {
       message.success(t('comp.playlistDrawer.addSuccess'));
       emit('update:modelValue', false);
+      // 刷新用户歌单列表，让用户页/详情页的歌曲总数(trackCount)及时更新（#508）
+      store.initializePlaylist().catch(() => {});
     } else {
       throw new Error(res.data?.msg || t('comp.playlistDrawer.addFailed'));
     }

src/renderer/views/music/MusicListPage.vue

@@ -631,6 +631,8 @@ const handleRemoveSong = async (songId: number) => {
       displayedSongs.value = displayedSongs.value.filter((s) => s.id !== songId);
       completePlaylist.value = completePlaylist.value.filter((s) => s.id !== songId);
       musicStore.removeSongFromList(songId);
+      // 刷新用户歌单列表，让用户页的歌曲总数(trackCount)及时更新（#508）
+      userStore.initializePlaylist().catch(() => {});
     }
   } catch (error) {
     console.error('删除歌曲失败:', error);