v0.3.0

What's changed

• Added colour and colour-temperature controls for compatible lights, including favourite colours configured in Home Assistant.
• Added optimistic UI reconciliation for sliders and colour controls, avoiding jumps back to stale values while commands are pending.
• Snapped committed slider values to device-declared steps.
• Added unique command tags so failed actions roll back only the matching pending value.
• Preserved an explicitly empty favourite-colour list.

Thanks @s3ansh33p for the contribution in #4.