A new Display-group select (Default / Monospace) sets the font for the timer and LTC digits. Monospace keeps the numbers from shifting sideways as they change — easier to read on a fast-moving countdown or timecode. Flows through server state → client applies a `tm-mono` class and re-fits the digit sizing; both timer and LTC values (.tm-time) honor it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>