Restrict Cypress uncaught exception suppression to known benign errors

Co-Authored-By: Codex <codex@openai.com>

cypress/support/e2e.js

@@ -20,9 +20,11 @@
 
 // Import commands.js using ES2015 syntax:
 import "./commands";
-Cypress.on("uncaught:exception", (err, runnable) => {
-  // returning false here prevents Cypress from failing the test
-  return false;
+import { getCypressUncaughtExceptionDecision } from "./uncaughtExceptionPolicy";
+
+Cypress.on("uncaught:exception", (error) => {
+  // Ignore only known benign browser/runtime noise; fail all other app errors.
+  return getCypressUncaughtExceptionDecision(error);
 });
 
 // Alternatively you can use CommonJS syntax:

cypress/support/uncaughtExceptionPolicy.js

@@ -0,0 +1,26 @@
+// The Lucia project.
+// Copyright 2026-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   imacat.yang@dsp.im (imacat), 2026/03/08
+/**
+ * Returns whether an uncaught exception should be ignored in Cypress.
+ * @param {unknown} error - The thrown uncaught exception.
+ * @returns {boolean} True when the exception is known-benign and safe to ignore.
+ */
+export function shouldIgnoreUncaughtException(error) {
+  const message = error instanceof Error ? error.message : String(error);
+  const ignorePatterns = [
+    /ResizeObserver loop limit exceeded/i,
+    /ResizeObserver loop completed with undelivered notifications/i,
+  ];
+  return ignorePatterns.some((pattern) => pattern.test(message));
+}
+
+/**
+ * Converts ignore policy into Cypress uncaught-exception callback return value.
+ * @param {unknown} error - The thrown uncaught exception.
+ * @returns {false|undefined} False to ignore, undefined to let Cypress fail the test.
+ */
+export function getCypressUncaughtExceptionDecision(error) {
+  return shouldIgnoreUncaughtException(error) ? false : undefined;
+}