Merge branch 'codex/ignore-local-artifacts' into 'master'

chore: ignore local development artifacts

See merge request !6

.gitignore

@@ -25,3 +25,11 @@ _sync_files.py
 _write_phone_image_cell.py
 start-backend-jdk17.bat
 backend/.mvn/jvm.config
+
+# Local configuration, IDE state, and generated browser-test artifacts.
+.env
+.idea/
+.vite/
+frontend/.playwright-cli/
+frontend/test-results/
+test-results/