Add screenshot for experimental mode description (raylib UI test)

[TheSecurityDev]

Adds a screenshot test case for the experimental mode description.

Part of it might be cut off at the bottom because we need scroll support. I figured out a better way to scroll that doesn't require xdotool, (updated my other PR also), so I can do that here if you like, or in a followup PR.

Ahh, it looks like it just barely fit after all.

[Copilot]

Pull Request Overview

Adds a new screenshot test case for the experimental mode description in the raylib UI tests. This allows capturing screenshots of the expanded experimental mode description panel for testing purposes.

• Adds a new test setup function for the experimental mode description
• Registers the new test case in the CASES dictionary

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[github-actions]

raylib UI Preview

All Screenshots

[sshane]

Part of it might be cut off at the bottom because we need scroll support. I figured out a better way to scroll that doesn't require xdotool, (updated my other PR also), so I can do that here if you like, or in a followup PR.

so the most useful thing here isn't seeing the entire description, it's seeing that the html renderer is properly rendering the description at least somewhat. it's not entirely broken (which it was before)

[sshane]

Want to add the confirmation dialog too?

[maxime-desroches]

We should also have text entered on the keyboard screenshot

[TheSecurityDev]

Want to add the confirmation dialog too?

Isn't that already implemented? But I noticed the onroad UI is missing. I was thinking of trying that but maybe it's something you would rather do. Oh and the alerts with status colors would be good.

I could do the uppercase keyboard version, and one with numbers too.

[sshane]

Oh I mean for experimental mode/alpha long with html renderer

[sshane]

The full size alert was recently broken since there was no test for it, it'd be great to test that