chore: Add some tests

frontend/playwright.config.ts

@@ -31,8 +31,7 @@ export default defineConfig({
   ],
 
   webServer: {
-    command:
-      'cd .. && conc -n "frontend,backend,docker" "cd frontend && bun run start" "cd backend/ && sleep 15 && watchexec -r -e java ./gradlew :bootRun" "docker compose up"',
+    command: 'cd .. && just start',
     // **IMPORTANT CHANGE HERE:**
     // Point to your backend's health check endpoint.
     // If your Spring Boot app uses Actuator, it might be /actuator/health