fix: 修复系统文件窗口导入错误

[Flinglin]

由于轻信了 #474 中gemini的建议，未进行严格审查，导致 #474 中存在未使用导入和语法错误。此次提交已通过pnpm typecheck，pnpm format，pnpm lint 检查。请尽快合并，以免影响后续开发

[gemini-code-assist]

Code Review

This pull request refactors src/main/utils/windowUtils.ts by consolidating imports and removing a redundant closing brace. The reviewer suggests maintaining multi-line imports for consistency with the rest of the project and better readability.