fix(ai): Fix error propagation during setup

[daymxn]

I found that in certain edge case situations, errors could end up not propagating up during the initial setup of a live session. While fixing said error, I realized that the setup process could actually be cleaned up a decent amount. While this could cause issues if the model ever sent messages out of order (ie; a message before setupComplete), this doesn't seem like something we should necessarily design around. Furthermore, separating the setup process into a more iterative async style approach not only makes things easier to read (and reason about), but also solves various edge case error propagation issues.

The change has been tested on a local device, and seems to be working perfectly; existing functionality works, and the errors that were previously not being propagated are now properly bubbling up.

The process has also been split into helper functions, to make things easier to read, and to allow me to add documentation for each.

#no-changelog

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[ncooke3]

LGTM with acceptable CI

[ncooke3]

/gemini review

[gemini-code-assist]

Code Review

This pull request significantly improves the live session setup process by refactoring it into a more linear and robust async flow. The changes enhance readability and fix error propagation issues by replacing a complex Task-based mechanism with clearer, sequential helper functions. Additionally, the introduction of dedicated functions for message encoding/decoding and error mapping is a great cleanup. My review focuses on one potential edge case in the new setup logic where a graceful connection closure could leave the session in an inconsistent state, and I've provided a suggestion to make it more resilient.