Clean up gitignore and remove test artifacts from repo

Co-authored-by: GeekTrainer <[email protected]>

Author: Copilot

.gitignore

@@ -37,4 +37,8 @@ instance/
 .webassets-cache
 flask_session/
 .coverage
-htmlcov/
+htmlcov/
+
+# playwright
+client/test-results/
+client/playwright-report/