fix: address code review feedback on issue-triage batch PR (#181, #183, #189, #196, #207, #208, #210)

common:
- Make KIDS_LOCK_GENERIC also a read-only BinarySensorDesc (device_class='lock'),
  flipping value_fn to not bool(v) so /kidslock/0 value=False and
  /kidslock/vs/0 kidsLock='Ready' render with the same polarity ('On'
  means open/unlocked per HA's lock device class). The old SwitchDesc
  form never honored device_class='lock' -- HA's switch platform only
  accepts 'outlet'/'switch' -- so the surface was a plain switch whose
  'On' meaning drifted across boards. Tests updated.

air_monitor:
- Add state_class='measurement' to dust/fine_dust/super_fine_dust so
  the readings feed HA long-term statistics (co2 already had it).
- Import _AIR_QUALITY_SENSORS from air_purifier instead of duplicating
  it byte-for-byte; update common.sensor_item_value's docstring to
  mention the third caller.

by_type/__init__: drop trailing whitespace on the new 'ASM' line.

translations/en.json + nl.json: move the new 'dnd' switch entry to its
correct alphabetical position (after display_light, before fast_preheat).

SKILL.md: add an explicit read-side rule to §5's educated-guesses
section -- guessed unit/device_class/state_class on a SensorDesc
silently mislabels readings forever with no 4.xx to catch it (unlike
guessed writes, which the device rejects). The prior air_monitor
docstring cited this carve-out as if it existed; now it does.

tests/water_purifier (issue #196): change the ailite fixture's
favorite.defaultTemperature from '85' to '50' so the test actually
reproduces the reported bug -- '50' is in showList only, so a
descriptor reading from supportedList would fail the assertion that
the current default is in its options list.

tests/test_common_capabilities.py

@@ -232,13 +232,19 @@ class TestWmSetinfoFlags:
 
 
 class TestKidsLockFallback:
-    def test_generic_read_write(self):
+    def test_generic_is_read_only(self):
+        """Issues #181/#183: the kids-lock resource is read-only on real
+        hardware (writing the *correct* value still 4.05s, and no
+        SwitchDesc device_class='lock' is honored by HA -- the switch
+        platform only accepts 'outlet'/'switch'). KIDS_LOCK_GENERIC and
+        KIDS_LOCK_VS_FALLBACK now share the same shape (BinarySensorDesc,
+        device_class='lock', same key) so both surfaces render with the
+        same polarity: 'On' means open/unlocked."""
         assert common.KIDS_LOCK_GENERIC.href == '/kidslock/0'
         desc = common.KIDS_LOCK_GENERIC.entities[0]
-        assert desc.value_fn(True) is True
-        path, body = desc.write_fn('On', {})
-        assert path == ['kidslock', '0']
-        assert body == {'value': True}
+        assert isinstance(desc, BinarySensorDesc)
+        assert desc.value_fn(False) is True   # value=False -> On=Unlocked
+        assert desc.value_fn(True) is False   # value=True -> Off=Locked
 
     def test_vs_fallback_gated(self):
         assert common.KIDS_LOCK_VS_FALLBACK.match_fn({}, {'/kidslock/vs/0': {}}) is True