refactor(player): 提取播放栏共享逻辑为 composable

- 新增 useVolumeControl：统一音量管理（volumeSlider、mute、滚轮调节）
- 新增 useFavorite：收藏状态与切换
- 新增 usePlaybackControl：播放/暂停、上/下一首
- PlayBar、MiniPlayBar、SimplePlayBar、MobilePlayBar 使用新 composable
- 修复音量存储不一致：MiniPlayBar/SimplePlayBar 原先绕过 playerStore 直接操作 localStorage

src/renderer/hooks/useVolumeControl.ts

@@ -0,0 +1,49 @@
+import { computed } from 'vue';
+
+import { usePlayerStore } from '@/store/modules/player';
+
+/**
+ * 统一的音量控制 composable
+ * 通过 playerStore 管理音量，确保所有播放栏组件的音量状态一致
+ */
+export function useVolumeControl() {
+  const playerStore = usePlayerStore();
+
+  /** 音量滑块值 (0-100) */
+  const volumeSlider = computed({
+    get: () => playerStore.volume * 100,
+    set: (value: number) => {
+      playerStore.setVolume(value / 100);
+    }
+  });
+
+  /** 音量图标 class */
+  const volumeIcon = computed(() => {
+    if (playerStore.volume === 0) return 'ri-volume-mute-line';
+    if (playerStore.volume <= 0.5) return 'ri-volume-down-line';
+    return 'ri-volume-up-line';
+  });
+
+  /** 静音切换 (0 ↔ 30%) */
+  const mute = () => {
+    if (volumeSlider.value === 0) {
+      volumeSlider.value = 30;
+    } else {
+      volumeSlider.value = 0;
+    }
+  };
+
+  /** 鼠标滚轮调整音量 ±5% */
+  const handleVolumeWheel = (e: WheelEvent) => {
+    const delta = e.deltaY < 0 ? 5 : -5;
+    const newValue = Math.min(Math.max(volumeSlider.value + delta, 0), 100);
+    volumeSlider.value = newValue;
+  };
+
+  return {
+    volumeSlider,
+    volumeIcon,
+    mute,
+    handleVolumeWheel
+  };
+}