Ultrono Arena macOS client

Build ref: 90e0143caeb4
Branch: master
Built at: 20260703T065846Z
Architectures: x86_64 arm64
Deployment target: macOS 11.0

Audio is enabled through miniaudio.
JPEG loading uses the bundled static IJG JPEG library.

Double-click Ultrono Arena.app to start the client.
User-editable config is stored in ~/Library/Application Support/Ultrono Arena.
