fix(climate): omit unsupported 'off' from fancoil fan modes (#410)

[GreenGrassBlueOcean]

Resolves #410. Related to OpenWebNet-HA/openwebnet-mcp#1.

Root Cause

In OpenWebNet WHO=4 (Temperature Control) specifications, Dimension 11 (Fan coil Speed) status values are 0=Auto, 1=Speed 1, 2=Speed 2, 3=Speed 3, and 15=OFF (read-only status).
Speed code 4 was a legacy non-standard placeholder which does not exist in the BTicino OpenWebNet protocol and is silently dropped by physical gateways (e.g. F461). Furthermore, physical thermostats (such as LN4691, 3550) only cycle Auto -> Speed 1 -> Speed 2 -> Speed 3 -> Auto without an independent off fan mode while active; fancoils are stopped automatically by actuator idle state (Dimension 20, Val 5) when target temperature is reached or when setting the zone to HVACMode.OFF.

Changes

1. custom_components/myhome/climate.py:
   • Omitted "off" from _attr_fan_modes. The list of supported fan modes is now ["auto", "low", "medium", "high"].
   • Removed "off": 4 from fan_mode_map in async_set_fan_mode().
   • Ensured incoming D11 frames with fan_on=False or 15 update actuator state attributes (running_fan_speed) rather than overwriting target preset _attr_fan_mode.
2. Tests:
   • Updated tests/test_component_climate.py, tests/test_issue_303.py, and tests/test_trace_replay.py to match the 4 supported fan modes.
   • Added test assertion that attempting to set unsupported "off" fan mode raises ServiceValidationError.
   • 1732 passed, 100.0% coverage preserved across custom_components/myhome.

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