feat: Reachy Mini logo as app icon (PNG via Git LFS)

feat: Demo mode for filming two robots conversing

ui: compact, denser layout so message + transcript fit together

fix: clap the RIGHT antenna into the held LEFT (was the non-colliding mirror)

tune: robust live detector + calibrated robot clap from hardware test

tune: calibrate speed presets from through-air mic test (unit floor ~120ms)

feat: initial Reachy Mini Morse Code app