unidex v1.2

Upgrades since v1.1:

Badges

• Send to device: the badge maker (tools/badge-maker.html) puts a badge straight onto the board over USB
  (Chrome/Edge, Web Serial). The board opens it immediately. Never overwrites an existing badge; keeps the
  Dex, events and settings.
• Picker: hold B in the Badge app for 3x3 thumbnails. A moves, B opens, hold B goes back. Thumbnails are
  cached in RAM, so moving is fast.

Buttons

• The press that wakes the board also counts: tap A on a sleeping home screen and it wakes and moves in one go.
• Restart: hold A + B for 1 second. Boots fresh to home, keeps all data (badges, Dex, events, settings, clock).
• B long on home refreshes the time and battery.

Power

• Stays awake on USB power (a computer connected, or the charger topping up), so the Mac sync, the badge
  maker and flashing always find it. Still sleeps on battery.

Clock

• Fixed: the clock chip (PCF85063) came from the factory stopped and in 12-hour mode, so the time froze while
  asleep. It now runs in 24-hour mode and is set the way the datasheet recommends.
• The home clock ticks live each minute while awake; asleep it counts silently and catches up on the next press
  (no wake-ups, so no battery cost).
• New USB command C: clock chip diagnostics.

Dex

• Hidden networks are left out.