fix(execute): misclassify Turnkey API errors as user cancellations

[sentry]

This PR addresses issue SOLID-D5, where actual Turnkey API failures were being misclassified as Error: User cancelled transaction.

Problem:
The isWebAuthnUserCancelledError function in lib/execute.ts contained an overly broad check (message.includes('failed to sign')). This caused legitimate Turnkey API errors, such as "Failed to sign: Turnkey error 3: activity timestamp is not current", to be incorrectly identified as user-initiated passkey cancellations. As a result, the application would report a generic "User cancelled transaction" error, obscuring the true underlying API failure from both users and Sentry.

Solution:

1. Removed isWebAuthnUserCancelledError: The problematic isWebAuthnUserCancelledError function was removed from lib/execute.ts.
2. Utilized isPasskeyPromptError: The existing and more precise isPasskeyPromptError function from lib/utils/passkey.ts is now used in lib/execute.ts (for transaction execution error handling) and hooks/useWirexThreeDs.ts (for 3DS flow error handling). This function correctly distinguishes between user cancellations and actual API errors.
3. Added Regression Tests: New test cases were added to lib/utils/__tests__/passkey-credentials.test.ts to specifically assert that isPasskeyPromptError returns false for Turnkey API error messages, ensuring the fix holds.

This change ensures that real API failures are no longer silently swallowed and are reported accurately.

Fixes SOLID-D5

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