feat(download): 新增未保存下载设置时的确认对话框 (#507)

- feat(download): 关闭下载设置抽屉时检测未保存更改，提供取消/放弃/保存选项
- fix: 自动播放首次暂停无法暂停，移除不必要的 isFirstPlay 检查
- fix: 歌手详情路由添加 props key，修复跳转歌手详情不生效问题
- i18n: 添加 download.save.* 翻译（5 种语言）

Co-Authored-By: 心妄 <1661272893@qq.com>

src/renderer/store/modules/playlist.ts

@@ -585,8 +585,7 @@ export const usePlaylistStore = defineStore(
         // Toggle play/pause for current song
         if (
           playerCore.playMusic.id === song.id &&
-          playerCore.playMusic.playMusicUrl === song.playMusicUrl &&
-          !song.isFirstPlay
+          playerCore.playMusic.playMusicUrl === song.playMusicUrl
         ) {
           if (playerCore.play) {
             playerCore.setPlayMusic(false);