Enable macOS diagnostics and UI improvements

This release introduces performance diagnostics for macOS release candidates, allowing users to export detailed diagnostics data. It also improves the settings interface by showing diagnostics status errors and defers storage tasks to improve startup behavior.

What's New

• Performance diagnostics are now available in macOS release-candidate builds, capturing startup, responsiveness, resource usage, and polling metrics.

• Users can export redacted diagnostics data as JSON from the Settings for support purposes.

• Diagnostics collection is enabled only for release-candidate builds, not standard production releases.

Improvements

• Settings page now displays errors if diagnostics status cannot be loaded successfully.

• Storage-related operations have been moved off the startup path to improve application responsiveness at launch.