Fix: iOS passkey cancellations logged as exceptions

[sentry]

This PR addresses an issue where user-cancelled passkey login prompts on iOS devices were incorrectly captured as exceptions in Sentry, rather than being treated as benign warnings.

Problem:
On iOS (Expo/React Native), when a user cancels a passkey login prompt, the error object received has error.name === 'UserCancelled' and a message like 'The user cancelled the request.'. The existing error handling in hooks/useUser.ts at line 434 only checked for error?.name === 'NotAllowedError' to identify user cancellations. As a result, iOS cancellations fell into the generic else block, triggering Sentry.captureException(new Error('Error logging in')).

Root Cause:
The isWebAuthnUserCancelledError helper in lib/execute.ts already contains logic to correctly identify various forms of user-cancelled WebAuthn prompts, including those with 'user cancelled' in the message. However, this helper was not being used in the login error handling path in hooks/useUser.ts.

Solution:

1. Imported isWebAuthnUserCancelledError from @/lib/execute into hooks/useUser.ts.
2. Modified the conditional check at line 434 in hooks/useUser.ts to include the isWebAuthnUserCancelledError(error) check. This ensures that iOS-specific cancellation errors are now correctly identified and logged as warnings, preventing unnecessary Sentry exceptions.
3. Added a new test file lib/__tests__/execute.test.ts to specifically cover the isWebAuthnUserCancelledError helper, including a test case for the iOS UserCancelled error shape.

This change ensures that user-initiated cancellations are handled gracefully across all platforms, improving error reporting accuracy.

Fixes SOLID-ZN

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