DefaultBrowserSwitcher v1.0 Preview 1 Universal

Preview build for DefaultBrowserSwitcher 1.0 (1).

Warnings:

• This is a preview build.
• It is adhoc, not notarized.
• macOS may warn on first launch.
• Recommended first-run path is right-click "Open".

This prerelease is intended for evaluation and limited testing, not trusted general distribution.