fix: clamp() collapsed to minimum when min_brightness > max_brightness (#1507)

* fix: clamp() collapsed to minimum when min_brightness > max_brightness

A user can intentionally set min_brightness > max_brightness (or the
equivalent for color temperature) for an inverted timescale -- e.g. a
porch light that should be brighter at night than during the day.
clamp()'s max(minimum, min(value, maximum)) assumed minimum <= maximum;
when inverted, min(value, maximum) is always <= maximum < minimum, so
max(minimum, ...) always returns minimum. linear and tanh brightness
modes -- both of which end in a clamp(brightness, min_brightness,
max_brightness) call -- got stuck returning one fixed value regardless
of the time of day.

Fixes #1421

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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* test: accept current Home Assistant brightness validation errors

Keep asserting the maximum brightness limit without depending on the validation library's dictionary-path wording.

---------

Co-authored-by: Oscar Pacheco <proscar@MacBook-Pro-de-Oscar.local>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Bas Nijholt <bas@nijho.lt>
Co-authored-by: Bas Nijholt <basnijholt@gmail.com>

tests/test_switch.py

@@ -1727,7 +1727,7 @@ async def test_change_switch_settings_service(hass):
     # Test changing to illegal max brightness
     with pytest.raises(
         voluptuous.error.MultipleInvalid,
-        match="value must be at most 100 for dictionary",
+        match="value must be at most 100",
     ):
         await change_switch_settings(**{CONF_MAX_BRIGHTNESS: 5000})