Sonos source switcher

macOS menu bar app. Sets the Mac's default audio output and puts a specific Sonos Five on Line-In at the same time, so one click moves sound between setups instead of two. Also handles Sonos volume and EQ.

The speaker is discovered on the local network.

make app   # produces build/SonosLineInSwitcher.app

RELEASE.md was written aiming at App Store preparation. Unclear whether that went anywhere.

State

Nine modified files and an untracked Design/ folder, uncommitted. See the recommendation.