feat: add dev-e2e-clean target to remove test artifacts

Author: wrn14897

Makefile

@@ -112,6 +112,11 @@ e2e:
 	@echo "Using E2E slot $(HDX_E2E_SLOT) (ch=$(HDX_E2E_CH_PORT) mongo=$(HDX_E2E_MONGO_PORT) api=$(HDX_E2E_API_PORT) app=$(HDX_E2E_APP_PORT))"
 	./scripts/test-e2e.sh
 
+# Remove E2E test artifacts (results, reports, auth state)
+.PHONY: dev-e2e-clean
+dev-e2e-clean:
+	rm -rf packages/app/test-results packages/app/playwright-report packages/app/blob-report packages/app/tests/e2e/.auth
+
 # Run a specific E2E test file or grep pattern (dev mode: hot reload)
 # Usage:
 #   make dev-e2e FILE=navigation                    # Run tests/e2e/**/navigation*.spec.ts