chore: ignore code coverage settings file

The Settings.json for Unity Code Coverage is only used for local
development. CI uses its own coverageOptions in the workflow file,
so this file doesn't need to be tracked.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Author: JasonXuDeveloper

.gitignore

@@ -17,6 +17,9 @@ UnityProject/Build/*
 /UnityProject/HybridCLRData
 /UnityProject/UserSettings
 
+# Unity package settings (local preferences)
+/UnityProject/ProjectSettings/Packages/com.unity.testtools.codecoverage/Settings.json
+
 # Unity Test Framework temporary scenes
 /UnityProject/Assets/InitTestScene*.unity
 /UnityProject/Assets/InitTestScene*.unity.meta