bug: select trigger has no visual open-state highlight in modern appearence: base-select <select>

[oliverhaas]

Reproduction URL (Required)

https://daisyui.com/components/select/

What version of daisyUI are you using?

v5.5.19

Which browsers are you seeing the problem on?

Chrome

Describe your issue

Originally raised in #4527. This issue is just for a more complete trail per CONTRIBUTING.md. I'll open a PR in a second. Hope it's fine that it isn't assigned to me yet.

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For an OS native style option open dropdown, the select toggle is :focus when open

while for the appearence: base-select it is not :focus, both technically and visually

and I would have expected visually this here

Fix could be to piggybag the :open, which is only active for appearance: base-select <select> elements.

[github-actions]

Thank you @oliverhaas for reporting issues. It helps daisyUI a lot 💚
I'll be working on issues one by one. I will help with this one as soon as a I find a solution.
In the meantime providing more details and reproduction links would be helpful.