v0.4.0-GuppyKE

Added

• Guided Axis Twist Compensation calibration wizard in the Tune tab.
• WiFi power-save toggle for lower latency — re-applied on every reconnect / network switch, and a
  boot-race fix so it survives a reboot.
• Documentation: KAMP + Axis Twist Compensation first-layer guide (wiki + README link).

Fixed

• "Now printing" overlay jitter — steadied and made into a single tap target.