Encoder/dial support (Mirabox family)

[fabiosammy]

The 0x0060 has no encoders, but the Mirabox "Stream Dock" family does. Add support so other devices can use rotary/dial inputs.

What to do

1. Parse encoder fields from the input report (see mirajazz state.rs: EncoderStateChange / EncoderTwist).
2. Extend the read path to emit encoder events; add a YAML mapping for turn/press.
3. Validate against a device that actually has encoders.

Reference: deck.rb TODO header; Deck#read_press in lib/fifine_deck.rb.