macOS 27 Support, Proper Intel Support

This update brings a refreshed UI and some additional refinements.

What's new

• New, more compact, more reliable sensor overlay to replace the old notification
• Support for log levels in the serial monitor (see README for more)
• UI enhancements for a cleaner macOS 27 look
• New, updated app icon for macOS 27
• New serial monitor implementation in native Swift that SHOULD support Intel Macs (Untested!)
• App is now notarized!