ImPPG 2.1.0 — macOS Tahoe build

Self-contained .app bundle for macOS arm64 (built on M3 Max / Tahoe 26.3, smoke-tested on M1). Includes the three source fixes from PR GreatAttractor#50 plus all Homebrew dylibs embedded via dylibbundler so no Homebrew install is required on the target Mac. Open the DMG, drag ImPPG.app to Applications.