fix custom widget e2e login race

e2e/custom-widgets-custom-jsx.spec.ts

@@ -45,8 +45,9 @@ describe("Custom JSX custom widgets", () => {
       await page.goto(`${baseUrl}/auth/login`);
       await page.getByLabel("Username").fill(adminCredentials.username);
       await page.locator("#password").fill(adminCredentials.password);
+      const loginNavigation = page.waitForURL(baseUrl, { timeout: 15_000, waitUntil: "commit" });
       await page.locator("css=button[type='submit']").click();
-      await page.waitForURL(baseUrl, { timeout: 15_000 });
+      await loginNavigation;
 
       await page.goto(`${baseUrl}/manage/custom-widgets/new`);
       await page.waitForURL("**/manage/custom-widgets/new", { timeout: 15_000 });