feat(menu): add cancel translucent option to right-click menu

- Add cancelTranslucent i18n translations (zh-CN: 取消半透明, en-US: Cancel Translucent)
- Add unTranslucentModel() method to Engine layer
- Add unTranslucentModel() proxy to EngineManager
- Add menu item after 'Transparent Selected' (order: 4)
- Update menu item order numbers (5-8)

src/locales/en-US.ts

@@ -37,6 +37,7 @@ export const enUS: TranslationDictionary = {
         componentDetail: 'Component Detail',
         hideSelected: 'Hide Selected',
         transparentSelected: 'Transparent Selected',
+        cancelTranslucent: 'Cancel Translucent',
         isolateSelected: 'Isolate Selected',
         hideOthers: 'Hide Others',
         transparentOthers: 'Transparent Others',