fix(signer): expire sessions on focus and on timer after init

[moldy530]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR focuses on enhancing session management in the SessionManager class by implementing a mechanism to automatically clear expired sessions.

Detailed summary

• Added a new property clearSessionHandle to track session expiration timers.
• Modified clearSession method to clear the timeout if it exists.
• Introduced registerSessionExpirationHandler method to set a timeout for session expiration.
• Updated setSession method to utilize registerSessionExpirationHandler for new sessions.

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[dphilipson]

Thanks for being so quick! Left a comment.

[dphilipson]

Looks great, thanks for the changes!