feat(gui-client): Tauri welcome screen

[ReactorScram]

Closes #3961

No tests yet, might be tricky to test since it's all I/O.
I cued it off the device ID being generated, so it will have a minor merge conflict with #3920

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1. UI polish, or disable the welcome screen temporarily

   UI polish, or disable the welcome screen temporarily
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Performance Test Results

TCP

Test Name	Received/s	Sent/s	Retransmits
direct-tcp-client2server	227.3 MiB (+0%)	228.7 MiB (+0%)	218 (-15%)
direct-tcp-server2client	230.9 MiB (-1%)	232.5 MiB (-1%)	173 (-31%)
relayed-tcp-client2server	147.6 MiB (+3%)	148.2 MiB (+2%)	162 (+49%)
relayed-tcp-server2client	154.1 MiB (-2%)	154.5 MiB (-2%)	170 (-13%)

UDP

Test Name	Total/s	Jitter	Lost
direct-udp-client2server	50.0 MiB (-0%)	0.21ms (+392%)	0.00% (NaN%)
direct-udp-server2client	50.0 MiB (+0%)	0.02ms (+32%)	0.00% (NaN%)
relayed-udp-client2server	50.0 MiB (-0%)	0.22ms (+127%)	0.00% (NaN%)
relayed-udp-server2client	50.0 MiB (+0%)	0.06ms (-6%)	0.00% (NaN%)

[jamilbk]

LGTM, OK if I push a couple UI commits into this PR at some point?

[ReactorScram]

@jamilbk Yep go for it

[jamilbk]

Still need to get to this one.

[ReactorScram]

I could reference the About and Settings windows and just make something rough for the time being

[jamilbk]

@ReactorScram I think this is ready for you take over. I need help wiring up the Sign in button to close the welcome window and launch the sign in flow. Could you finish that part of this PR? I think it's ready for merge after that.

[ReactorScram]

Got it hooked up and it works fine in Windows and Debian.

It sends the same command as clicking "Sign In" in the tray menu, so both of them will hide the Welcome window and open the browser for auth. If the window's already hidden it just opens the browser, since hide is idempotent.