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52af92d4b5
Implemented support for On/Off and Away modes in the template water heater platform, including optimistic control and lambda-based state reporting. Refactored the base 'WaterHeaterCall' to replace the 'state_' bitmask with 'optional<bool>' for 'on' and 'away' fields. This change was necessary to enable partial (delta) updates. The previous bitmask implementation did not distinguish between a field being "set to false" and "not set at all," causing unintended state resets (e.g., turning the device off when only adjusting temperature).