FreqTrace v0.4.2

Signed with an Apple Development certificate (not notarized). Opens cleanly on Macs that trust this developer; generally blocked on others.
On an unrecognized Mac, first launch: right-click FreqTrace.app > Open > Open.

What's Changed

• Build universal (arm64 + x86_64) Release for Intel + v0.4.2 by @vk0eppel in #60

Full Changelog: v0.4.1...v0.4.2