Apply button styles to file selector button

[lfuelling]

Hi,

this PR applies the existing button styles to the file selector button and adds a documentation section about that:

The ::file-selector-button selector is supported by all major browsers.

Thanks

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Name	Status	Preview	Comments	Updated (UTC)
7css	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 4, 2025 10:32am

[lfuelling]

Hi, this was open a long time as well, sorry again.

I separated the styles for the file selector, and the other buttons are now usable again, but I'm unable to get the file selector button to work like a proper button (the click and hover states don't work properly).

I'd still be in favor for this being merged, a somewhat styled file selector button is better than an unstyled file selector button imo.

[khang-nd]

Hey @lfuelling, sorry, I totally missed this! Will have a look and merge it in soon if no issues.