fix: Improve error handling and logging in chess user journey scenario

scenarios/chessUserScenario.js

@@ -13,18 +13,26 @@ export function chessUserJourney() {
     email,
     password,
   }), httpConfig);
-  check(registerRes, { 'Register: status 200': (r) => r.status === 200 });
+  const registerOk = check(registerRes, { 'Register: status 200': (r) => r.status === 200 });
+  if (!registerOk || !registerRes.body) {
+    console.error('Register failed or no body returned');
+    return;
+  }
 
   // Login
   const loginRes = http.post(`${BASE_URL}/api/account/login`, JSON.stringify({
     username,
     password,
   }), httpConfig);
-  check(loginRes, { 'Login: status 200': (r) => r.status === 200 });
+  const loginOk = check(loginRes, { 'Login: status 200': (r) => r.status === 200 });
+  if (!loginOk || !loginRes.body) {
+    console.error('Login failed or no body returned');
+    return;
+  }
 
   const jwt = loginRes.json('token');
   if (!jwt) {
-    console.error('Failed to get JWT token');
+    console.error('Failed to get JWT token from login response');
     return;
   }
 
@@ -40,11 +48,15 @@ export function chessUserJourney() {
     black: { id: `opponent_${__VU}`, displayName: 'Opponent' },
     timeControl: { limitSeconds: 300, incrementSeconds: 3 },
   }), { headers: authHeaders, timeout: '30s' });
-  check(importRes, { 'Import Game: status 200/201': (r) => r.status === 200 || r.status === 201 });
+  const importOk = check(importRes, { 'Import Game: status 200/201': (r) => r.status === 200 || r.status === 201 });
+  if (!importOk || !importRes.body) {
+    console.error('Import game failed or no body returned');
+    return;
+  }
 
   const gameId = importRes.json('gameId');
   if (!gameId) {
-    console.error('Failed to get gameId');
+    console.error('Failed to get gameId from import response');
     return;
   }