feat: Connectivity service and handling + Agent subprocess handling improvements

[charlesvien]

https://www.electronjs.org/docs/latest/tutorial/online-offline-events#overview

• Trust net.isOnline() for offline detection, only HTTP verify when transitioning from offline to online
• Allow the agent to auto reconnect and continue when connectivity comes back up but we need to handle session state properly here
• When the users internet cuts out we will display a connectivity error page through App.tsx, when connectivity is restored it will re-render the app and all state. We may want to still allow the user to navigate around the app while they are offline, which is more of an undertaking than what I have prototyped here (so far, still thinking, draft)
  • E.g. I imagine they might be able to get some work done locally but may want the conversational history in Array to reference while they are offline? Something like when you're on a plane but have no wifi because Delta sucks and want to carry on working.

Related: #309

[charlesvien]

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• feat: Connectivity service and handling + Agent subprocess handling improvements #407 👈 (View in Graphite)
• feat: Minor CI changes #410
• main

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