Implement climate.turn_on
#194
Open
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Resolves #181
This implements
turn_onand adds a "Last HVAC Mode" sensor with restore support and a lightweight in-memory store shared with the climate entity. The climate entity now persists the last active (non‑off) HVAC mode whenever the device mode updates, andturn_onuses that cached value (falling back to the first supported non‑off mode if none is known).