[Feat] 本地启动支持一键清除失效项

[Flinglin]

#478 中的失效项检测

[gemini-code-assist]

Code Review

This pull request introduces a feature to clean up invalid local shortcuts by checking if their target paths exist and deleting them if they do not. It adds a 'Delete invalid items' button to the UI, exposes a new deleteWhenNotExist IPC channel, and implements the deletion logic in the main process. The review feedback highlights several critical improvements: avoiding synchronous file checks (existsSync) in the Electron main process to prevent UI blocking, adding a confirmation dialog for safety before bulk deletion, ensuring robust state management using a finally block, and cleaning up redundant imports and syntax inconsistencies in the preload script.

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