Panel with recent notifications

[jprochazk]

• Closes Panel with recent log/notification messages #4304

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link	Manifest
✅	7ff684e	https://rerun.io/viewer/pr/8465	+nightly +main

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[emilk]

I love it! ❤️ FINALLY

[emilk]

Please document the difference between Info and Success

[jprochazk]

I don't know what the difference is, it came from ToastKind which was also undocumented. I guess someone wanted to use a different color?

[Wumpf]

This picks up stuff we didn't show in the viewer at all so far :/

Firefox windows:

This is also there on main, but there it's not shown as a toast notification

Edit: this is likely related to emil's comment here #8465 (comment)

[Wumpf]

it also needs a scroll bar 🤔 Can't reach the clear all anymore

(I provoked the error a bunch of time here, just as an example)

[teh-cmc]

Quick UX feedback: I would expect the panel to close when I click outside of it.

[jprochazk]

All of the following scenarios now work as expected:

• Click toggle button: Panel is open
• Click toggle button twice: Panel is closed
• Click toggle button, click inside the panel: Panel is open
• Click toggle button, click outside of panel: Panel is closed
• Click toggle button, press escape: Panel is closed
• Select something in the selection/time panel, click toggle button, press escape: Panel is closed, selection is preserved

The layout for individual notifications is still pretty gnarly, but it doesn't seem like I'll be able to use egui_flex for that, as it doesn't support max-width combined with flex-grow

[jprochazk]

...or maybe I just flip the layout a bit and it will be good enough?