fix: 修复 ref 未导入的错误

- 在 Player.vue 中添加缺失的 ref 导入
- 解决 "ReferenceError: Can't find variable: ref" 错误

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/Player.vue

@@ -1,6 +1,6 @@
 <!-- Player.vue - 添加预加载功能 -->
 <script setup lang="ts">
-import { computed, nextTick, useTemplateRef, watch } from 'vue'
+import { computed, nextTick, ref, useTemplateRef, watch } from 'vue'
 import { useRoute } from 'vue-router'
 import { useFavourites } from '../stores/useFavourites'
 import { usePlayQueueStore } from '../stores/usePlayQueueStore'