Fix macOS computer-use helper permission checks

[Jinwoo-H]

Summary

• run macOS computer-use permission status through the signed helper executable instead of LaunchServices
• launch the native provider agent through the helper executable so TCC evaluates the helper identity
• prevent the draggable permission tile from also moving the helper panel

Validation

• pnpm tc:node && pnpm test src/main/computer && pnpm lint src/main/computer
• pnpm build:computer-macos
• swift test --package-path native/computer-use-macos
• direct helper status returned accessibility=granted, screenshots=granted

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