Add Error Log Window

[God-damnit-all]

To make it easier to diagnose errors when spawned entirely from a GUI context, it would be desirable to add an error log window.

• Default to not showing the window on startup (but config to make it show anyway)
• Key assignment to show the window manually
• Allow certain conditions (such as error loading config, or connectivity errors with ssh/mux) to show the window
• The window would show a capture of the most recent log messages from the standard rust logging layer

[wez]

I think the current notifications are "OK" for their intended purpose, which is to let you know that something isn't working, rather than giving you a precise inventory of problems.

For the latter situation, I think that it is probably better overall if we had a separate window that we could show with an error log. I'm going to edit this issue to capture how I think that should work.

[God-damnit-all]

That's a good adaptation. Might I recommend configuration for tab flashing and/or user-selected sound file when an error does occur? (Startup being the exception.)

[wez]

Re: flashing/sounds: #3 is tracking the bell/alerting concept

[wez]

As of bb9504d I think this is "good enough".

[github-actions]

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