Review follow-up to PR #365, which landed the washer 0A/B0 labels and the
air-purifier PM device classes.
The three particulate units were spelled with U+00B5 MICRO SIGN. Home
Assistant's DEVICE_CLASS_UNITS holds only the U+03BC GREEK SMALL LETTER MU
spelling, so every purifier logged a per-entity "not a valid unit for the
device class" warning asking the user to file a bug against us. The two
characters render identically, and the PR's own test hardcoded the wrong
one, so the test agreed with the bug. That test now takes the expected
unit from HA's own constant, and a new registry-wide guard
(test_sensor_device_class_units.py, mirroring the SwitchDesc guard from
issue #349) checks every SensorDesc unit against HA -- these were the only
three invalid pairs among 29.
Getting this in before release matters more than usual: the recorder
writes unit_of_measurement into long-term statistics, so correcting it
afterwards would raise a "units changed" repair for anyone who had run the
released version.
Also settles what the second element of a dust reading's value[] is, which
was the open question behind issue #325's request for another dump. It is
the device's own graded air-quality level: it appears only on the fields
carrying a magnitude (Dust/FineDust/SuperFineDust/CO2) and not on
Odor/CleanLevel, which are grades already; it reads 0-2 against index 0's
0-31; and CleanLevel equals the highest per-field grade on 9 of the 11
fixtures reporting the resource. It stays unbound -- ARTIK051_TVTL grades
good air as 0 while every other family uses 1, so a shared descriptor
would need a per-family offset -- but it is what confirms the PM mapping
without relying on field names: 18 grades one step above the floor as
SuperFineDust yet sits at the floor as Dust, on two families that both
floor at 1, so the firmware itself treats the three fields as different
scales ordered coarse-to-fine. Each field's floor boundary also brackets
the Korean CAI band for its tier (PM10 at 30/31, PM2.5 at 15/16). Pinned
against the shipped fixtures in test_air_quality_grade_column.py.
air_monitor keeps its untyped sensors, but the docstring now gives the
real reason: the evidence carries over, and what is deliberately deferred
is the statistics migration for entities shipped unitless since issue #210.
Smaller fixes: en.json's "Mixed load" -> "Mixed Load" to match the
catalog's title casing and issue #363's own wording; de/ko gave B0 the
same string as the existing "34" Mixed, so a machine exposing both showed
two identical options; washer.py's shared-label list still said "'24'
Towels", which went stale when issue #343 found 24/33 transposed; and
0A/B0 now have a locale-wide translation guard like every other confirmed
code batch.
