chore: Update tailwind

[MichaelUnkey]

What does this PR do?

Updated tailwind to v4. Dashboard, Engineering and UI.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• Navigate around Dashboard and look for any styles that do not look right (Test Light and Dark mode).
• Navigate around Engineering and look for styles that do not look right (Test Light and Dark mode).
• Check for any new errors.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read Contributing Guide
• Self-reviewed my own code
• Commented on my code in hard-to-understand areas
• Ran pnpm build
• Ran pnpm fmt
• Ran make fmt on /go directory
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Unkey Docs if changes were necessary

[vercel]

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Project	Deployment	Actions	Updated (UTC)
dashboard	Ready	Preview, Comment	Feb 20, 2026 4:55pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
engineering	Ignored	Preview	Feb 20, 2026 4:55pm

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• Create PR with unit tests
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• Commit unit tests in branch migrate-tailwind

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[perkinsjr]

Can you upgrade to https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.2.0

Seems they perf boosted again

Also you have some conflicts :)

[ogzhanolguncu]

Looking great. I just have some comments about the things I always wanted to clean up AFAIK they are not actively used anywhere.

[MichaelUnkey]

Reworking stylesheets in separate PR https://linear.app/unkey/issue/ENG-2509/rework-style-sheets-for-simplicity