refactor(types): PEP-604 union sweep + UP007/UP045 enforcement

ruff --select UP007,UP045 --fix converted ~1760 sites across the
backend: `Optional[T]` → `T | None`, `Union[X, Y]` → `X | Y`. The
remaining module-level alias targets that ruff conservatively skips
(BindableFloatInput, ColorList, DeviceConfig) were converted by hand
earlier in the pass. black -formatted the result so the wider unions
fit cleanly under the 100-char line budget.

pyproject.toml now sets [tool.ruff.lint] extend-select = ["UP007",
"UP045"] so future legacy imports fire CI on every push. The
pre-commit ruff hook was bumped from v0.8.0 -> v0.15.12 to recognise
UP045 (split off from UP007 in v0.13).

server/tests/core/capture/test_edge_interpolation.py

@@ -9,7 +9,6 @@ from ledgrab.core.capture.edge_interpolation import (
     fallback_edge_to_leds,
 )
 
-
 # ---------------------------------------------------------------------------
 # average_edge_to_leds
 # ---------------------------------------------------------------------------

server/tests/core/processing/test_effect_registry.py

@@ -17,7 +17,6 @@ from ledgrab.core.processing.effect_stream import (
     _effect_renderer,
 )
 
-
 EXPECTED_EFFECTS = frozenset(
     {
         "fire",

server/tests/core/processing/test_metric_readers.py

@@ -21,7 +21,6 @@ from ledgrab.core.processing.metric_readers import (
     get_spec,
 )
 
-
 EXPECTED_METRICS = {
     "cpu_load",
     "ram_usage",

server/tests/core/test_audio_filters.py

@@ -13,7 +13,6 @@ import ledgrab.core.audio.filters  # noqa: F401
 
 from ledgrab.core.filters.filter_instance import FilterInstance
 
-
 # ---------------------------------------------------------------------------
 # Helpers
 # ---------------------------------------------------------------------------

server/tests/core/test_automation_engine.py

@@ -17,7 +17,6 @@ from ledgrab.storage.automation import (
 )
 from ledgrab.storage.automation_store import AutomationStore
 
-
 # ---------------------------------------------------------------------------
 # Fixtures
 # ---------------------------------------------------------------------------

server/tests/core/test_automation_rule_handlers.py

@@ -27,7 +27,6 @@ from ledgrab.storage.automation import (
     WebhookRule,
 )
 
-
 EXPECTED_RULE_TYPES = {
     StartupRule,
     ApplicationRule,

server/tests/core/test_cs2_adapter.py

@@ -4,7 +4,6 @@ import pytest
 
 from ledgrab.core.game_integration.adapters.cs2_adapter import CS2Adapter
 
-
 # ── Realistic CS2 GSI payload samples ────────────────────────────────────
 
 

server/tests/core/test_game_event_css.py

@@ -14,7 +14,6 @@ from ledgrab.storage.color_strip_source import (
     GameEventColorStripSource,
 )
 
-
 # ── Helpers ──────────────────────────────────────────────────────────
 
 

server/tests/core/test_game_event_value_source.py

@@ -13,7 +13,6 @@ from ledgrab.storage.value_source import (
     ValueSource,
 )
 
-
 # ---------------------------------------------------------------------------
 # GameEventValueSource model tests (Task 5)
 # ---------------------------------------------------------------------------

server/tests/core/test_ha_light_target_processor.py

@@ -2,7 +2,7 @@
 
 import asyncio
 from dataclasses import dataclass
-from typing import Any, Dict, List, Optional, Tuple
+from typing import Any, Dict, List, Tuple
 
 import numpy as np
 import pytest
@@ -12,7 +12,6 @@ from ledgrab.core.processing.target_processor import TargetContext
 from ledgrab.storage.bindable import BindableFloat
 from ledgrab.storage.ha_light_output_target import HALightMapping
 
-
 # ---------------------------------------------------------------------------
 # Test doubles
 # ---------------------------------------------------------------------------
@@ -115,9 +114,9 @@ class _FakeCSSManager:
 
 def _make_ctx(
     *,
-    ha_manager: Optional[_FakeHAManager] = None,
-    css_manager: Optional[_FakeCSSManager] = None,
-    vs_manager: Optional[_FakeVSManager] = None,
+    ha_manager: _FakeHAManager | None = None,
+    css_manager: _FakeCSSManager | None = None,
+    vs_manager: _FakeVSManager | None = None,
 ) -> TargetContext:
     return TargetContext(
         live_stream_manager=None,  # type: ignore[arg-type]

server/tests/core/test_mapping_adapter.py

@@ -11,7 +11,6 @@ from ledgrab.core.game_integration.mapping_adapter import (
     validate_adapter_yaml,
 )
 
-
 # ── YAML validation tests ───────────────────────────────────────────────