chore: provide more fine-grained websocket close code on errors

[phantumcode]

Issue #, if available:

Description of changes:

• update web socket close to include liveness-specific close code
• update timeout logic start the timeout timer when the oval is initially displayed to handle edge case when a face is detected and the oval is displayed and the user moves away immediately

Check points: (check or cross out if not relevant)

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[atierian]

Recommend using a stored property for the closeCode rather than computed to avoid the switch and nil coelescing operators. Approving as is though, lmk if you want to make that change and need a new approval.