Address independent review findings on the RAC finish-up branch

- Pin the FAN_ONLY reverse-write fallback to 'Wind' (the original single
  spelling) instead of letting it silently flip to 'Fan' just because
  'Fan' was added second to the dict -- _device_code_for_hvac() resolves
  the code from a unit's own supportedModes first, so this dict is only
  a fallback for a unit reporting none at all, and that fallback
  shouldn't change behavior as an unintended side effect of insertion
  order.
- Add direct tests for _preset_to_ha() (pure function, previously
  untested) and the FAN_ONLY fallback pin.
- Cross-reference the AC family's inverted Light_On/Light_Off polarity
  against air_purifier.py's plain-polarity use of the same token name on
  the same resource name, so a future refactor doesn't assume they're
  the same thing.
- Fix a one-column continuation-line misalignment and a stale PR-number
  reference in a comment.

custom_components/localthings/climate.py

@@ -71,9 +71,13 @@ _DEVICE_TO_HVAC: dict[str, HVACMode] = {
     # 'Fan' on others (e.g. TP1X_DA-AC-RAC-01011); both map to FAN_ONLY. The
     # reverse write can't rely on this map alone (two codes, one HA value) --
     # _device_code_for_hvac() resolves the code from the unit's own
-    # supportedModes.
-    'Wind': HVACMode.FAN_ONLY,
+    # supportedModes, so this is only a fallback for a unit reporting no
+    # supportedModes at all. 'Fan' is listed first so the {v: k} reverse
+    # comprehension below has 'Wind' win that fallback (last-key-wins),
+    # preserving the original single-spelling behavior rather than silently
+    # flipping it when 'Fan' was added.
     'Fan': HVACMode.FAN_ONLY,
+    'Wind': HVACMode.FAN_ONLY,
     # The device's 'Auto' is a single-setpoint "device decides" mode -> HA
     # HVACMode.AUTO (renders "Auto"). Not HEAT_COOL: that renders "Heat/cool"
     # and implies a two-setpoint heat+cool range these single-setpoint units

custom_components/localthings/registry/by_type/__init__.py

@@ -171,7 +171,7 @@ def for_device_by_model(model_num: str, description: str) -> Optional[DeviceRegi
     # /otninformation/vs/0 ships no swVersionInfo block at all, so
     # oneUiVersion is empty.
     if key is None and ('_RAC_' in (model_num or '')
-                         or '-RAC-' in (model_num or '').upper()):
+                        or '-RAC-' in (model_num or '').upper()):
         key = 'airconditioner'
     # System air conditioners (multi-indoor-unit commercial installs, e.g.
     # A-CAWW-TP2-20-COMMON, issue #52) report no oneUiVersion either and

custom_components/localthings/registry/capabilities/air_purifier.py

@@ -15,6 +15,13 @@ issue #56's follow-up (five diagnostics dumps captured with the physical unit
 set to Auto/Sleep/Low/Medium/High):
   Light_On / Light_Off  -- a plain on/off flag; MODE below models it as a
                             real switch, RMW-replacing just that one entry.
+                            NOT the same polarity as the AC family's own
+                            Light_On/Light_Off token on its own /mode/vs/0
+                            (airconditioner._display_light_on) -- that one is
+                            confirmed inverted (Light_Off means the panel is
+                            lit) on live hardware. Same token name, same
+                            resource name, different device type and
+                            opposite meaning -- don't unify them.
   Comode_Off            -- read 'Off' on *every* one of the five dumps,
                             including High/Low/Medium/Auto -- confirms this
                             is NOT the fan-speed selector (ruling out the

tests/test_climate_ac_modes.py

@@ -8,6 +8,7 @@ from homeassistant.components.climate import HVACMode
 
 from custom_components.localthings.climate import (
     _AI_COMFORT_MODE, _DEVICE_TO_HVAC, _HVAC_TO_DEVICE, PRESET_AI_COMFORT,
+    _preset_to_ha,
 )
 
 
@@ -42,5 +43,34 @@ def test_fan_only_still_reachable_via_wind():
     assert _DEVICE_TO_HVAC['Wind'] == HVACMode.FAN_ONLY
 
 
+def test_fan_only_still_reachable_via_fan():
+    """'Fan' (e.g. TP1X_DA-AC-RAC-01011) is a second FAN_ONLY spelling
+    alongside 'Wind' -- issue #91."""
+    assert _DEVICE_TO_HVAC['Fan'] == HVACMode.FAN_ONLY
+
+
+def test_fan_only_reverse_fallback_prefers_wind():
+    """_device_code_for_hvac() resolves FAN_ONLY from a unit's own
+    supportedModes first, so _HVAC_TO_DEVICE is only a fallback for a unit
+    reporting no supportedModes at all. That fallback must stay 'Wind' (the
+    original single spelling, predating 'Fan') rather than silently
+    flipping to whichever of the two duplicate-value entries happens to
+    come last in _DEVICE_TO_HVAC."""
+    assert _HVAC_TO_DEVICE[HVACMode.FAN_ONLY] == 'Wind'
+
+
 def test_preset_ai_comfort_constant():
     assert PRESET_AI_COMFORT == 'ai_comfort'
+
+
+def test_preset_to_ha_off_maps_to_preset_none():
+    from homeassistant.components.climate import PRESET_NONE
+    assert _preset_to_ha('Off') == PRESET_NONE
+
+
+def test_preset_to_ha_lowercases_other_codes():
+    """Every other device code is exposed as its lowercased self -- resolved
+    dynamically, not via a per-model table (issue #91)."""
+    assert _preset_to_ha('Sleep') == 'sleep'
+    assert _preset_to_ha('NanoSleep') == 'nanosleep'
+    assert _preset_to_ha('MotionIndirect') == 'motionindirect'

tests/test_climate_windfree.py

@@ -3,11 +3,12 @@
 test_climate_temperature_fallback.py).
 
 The preset side of issue #75 (WindFree/motion convenient modes not
-surfacing) is intentionally not addressed here: PR #91 replaces
-climate.py's static _DEVICE_TO_PRESET table with a generic resolver that
-reads any device preset code straight off the unit's own supportedModes,
-which covers WindFree/motion generically instead of a per-model dict --
-duplicating that here would just conflict with it.
+surfacing) is intentionally not addressed here: climate.py's
+_preset_to_ha() (issue #91) reads any device preset code straight off the
+unit's own supportedModes, replacing the old static _DEVICE_TO_PRESET
+table with a generic resolver that covers WindFree/motion generically
+instead of a per-model dict -- duplicating that here would just conflict
+with it.
 """
 from custom_components.localthings.climate import _DEVICE_TO_SWING, _SWING_TO_DEVICE