fix: temporarily disable vpn toggle after toggling off

[ethanndickson]

There appears to be a race between the VPN service reporting itself as disconnected, and the system extension process exiting. When the VPN is toggled off and on quickly, an error is shown:

This PR forces the user to wait 6 seconds before they can toggle the VPN back on.

6 seconds was chosen as on my machine it takes about that long for the app to log that the XPC connection was interrupted after the stopTunnel function returns, and the system informs the app the VPN has been disconnected.

The XPC connection in the network extension is in the global scope, so it makes sense for it's death to imply the process has finally exited.

Potentially related:

https://developer.apple.com/forums/thread/84920?answerId=252931022#252931022

[ethanndickson]

• fix: temporarily disable vpn toggle after toggling off #43 👈 (View in Graphite)
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[ThomasK33]

I'm not sure if we need this, as when toggling quickly in Tailscale, it leaves me in a disconnected state.
But I can see this being good enough for now.

[ethanndickson]

Yeah, I just thought a light guardrail can't hurt - it also means people are less likely to report it as an issue!