Clean up all remaining ruff errors; lint is now fully green

Config:
- .ruff.toml target-version py310 -> py312, matching pyproject's
  requires-python (>=3.12) and the 3.12 'type' aliases switch.py
  already ships. Unblocks two false invalid-syntax errors.
- Ignore D102 in tests (test-class methods), consistent with the
  existing D100/D103 test ignores.

Code (no behavior changes):
- COM812 trailing commas + UP017 dt.UTC via ruff --fix, black re-wrap
- RUF002: unicode minus/en-dash -> ASCII hyphen in docstrings
- SIM105: contextlib.suppress for the lux-reading parse in config_flow
- TRY300: move return out of try in _read_lux_sensor
- PLC0415: hoist inline asyncio/logging imports to module top
- E741: rename ambiguous 'l' comprehension variable to light_id
- PT006/PT018: parametrize tuple + split compound assertion
- D102: docstring for OptionsFlow.async_step_init
- ARG001/ARG002: noqa with justification on HA-required signatures
- PLR0912/PLR0915: noqa on prepare_adaptation_data and
  _update_attrs_and_maybe_adapt_lights (upstream-inherited complexity;
  splitting would hurt readability more than it helps)

./scripts/lint passes clean; 148 tests pass.

webapp/app.py

@@ -298,7 +298,7 @@ def time_to_float(time: dt.time | dt.datetime) -> float:
 
 
 def _kw(input):
-    location = Location(LocationInfo(timezone=dt.timezone.utc))
+    location = Location(LocationInfo(timezone=dt.UTC))
     return {
         "name": "Adaptive Lighting Simulator",
         "adapt_until_sleep": input.adapt_until_sleep(),