fix(login): Correctly handle iOS Turnkey user cancellations

[sentry]

This PR addresses an issue where user-initiated cancellations during the login process on iOS devices were being incorrectly reported as critical errors in Sentry.

Problem:
On iOS, when a user cancels the biometric or passkey prompt during login (e.g., via Turnkey), the error object returned by Turnkey has the shape { error: 'UserCancelled' }. However, the useUser.ts login catch block was only checking for error?.name === 'NotAllowedError' to identify user cancellations. This mismatch caused legitimate user cancellations to fall through to the generic error capture, leading to false Error logging in reports in Sentry.

Solution:

1. Enhanced isWebAuthnUserCancelledError: The shared utility function isWebAuthnUserCancelledError in lib/execute.ts has been extended to include a check for error?.error === 'UserCancelled'. This makes the helper robust enough to identify Turnkey's iOS-specific cancellation signal.
2. Updated useUser.ts: The login error handling in hooks/useUser.ts now utilizes the enhanced isWebAuthnUserCancelledError helper. This ensures that user cancellations on iOS are correctly identified and handled as warnings (or silently), preventing them from being reported as errors.

Impact:
This fix reduces Sentry noise by accurately classifying user cancellations during iOS login, providing a clearer view of actual login failures.

Fixes SOLID-115

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