✨ feat(ui): add settings menu and mask opacity control

- Add SettingsMenu component for quick navigation between settings sections
- Add mask opacity control to adjust overlay transparency
- Optimize search suggestions with immediate response and smooth animations
- Refine component styles for more compact interface
- Fix Translation interface type definition for maskOpacity
- Unify Bilibili API path to simplify environment handling

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

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

src/i18n/locales/zh.ts

@@ -14,6 +14,7 @@ export const zh: Translation = {
   searchHistory: '搜索历史记录',
   backgroundBlur: '背景模糊度',
   searchBoxOpacity: '搜索框不透明度',
+  maskOpacity: '遮罩层不透明度',
 
   // Wallpaper Settings
   wallpaperSettings: '壁纸设置',