test(gateway): update claim form test for Enter-advances-fields behavior

The test expected Enter to immediately submit and show a validation error,
but Enter now advances to the next field. Updated the test to press Enter
through all fields before expecting the submission validation error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: aidandaly24

src/cli/tui/screens/mcp/__tests__/AddGatewayJwtConfig.test.tsx

@@ -409,8 +409,14 @@ describe('Custom Claims Form', () => {
     }
     await delay();
 
-    // Press Enter without filling matchValue
-    stdin.write(ENTER);
+    // Enter advances through fields: claimName -> valueType -> operator -> matchValue
+    stdin.write(ENTER); // advance to valueType
+    await delay();
+    stdin.write(ENTER); // advance to operator
+    await delay();
+    stdin.write(ENTER); // advance to matchValue
+    await delay();
+    stdin.write(ENTER); // submit on last field — matchValue is empty
     await delay();
 
     expect(lastFrame()).toContain('Match value is required');