feat/passkey-pairing

[My-con]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces support for WhatsApp passkey pairing, adding several new endpoints (/session/passkey-response, /session/passkey-confirm, and /session/passkey-status), updating existing session status endpoints, and implementing a frontend UI modal and polling mechanism to handle the passkey flow. It also adds comprehensive unit tests and a background cleanup routine for stale passkey states. Feedback on the changes highlights a potential nil pointer dereference on state.Client in the passkey response handler, a missing implementation for auto-confirming passkeys when SkipHandoffUX is enabled, a memory leak of stale passkey states in stdio mode due to the cleanup routine not being started, and a minor frontend issue where the safety timeout is not cleared upon successful login.

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[My-con]

Hi! Would you mind helping me finish this PR? I'd really appreciate it if you could take a look when you have some time. Thanks in advance!

[oAllanWeb]

@asternic ?