feat: tailwind 4 migration

[FRSgit]

Related issue

Closes #

Scope of work

https://tailwindcss.com/docs/upgrade-guide

To avoid some of the breaking changes introduced by Tailwind 4 and to keep sensible defaults we want to give to out users, SFUI Tailwind configuration:

• brings back the possibility to set the default outline width, color and offset (see the discussion here). I think it might be good to add those back for all affected utilities (borders/rings/divides).
• adds the cursor: pointer style for button elements.
• reimplements automated dark mode that will support both media AND classname mode.

Screenshots of visual changes

Checklist

• Self code-reviewed
• Changes documented
• Semantic HTML
• SSR-friendly
• Caching friendly
• a11y for WCAG 2.0 AA
• examples created
• blocks created
• cypress tests created

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Latest commit: 9687eb4

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