Update dependency tailwindcss to v4 - abandoned

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tailwindcss (source)	3.4.17 -> 4.0.1

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Release Notes

tailwindlabs/tailwindcss (tailwindcss)

v4.0.1

Compare Source

Added

• Include :open pseudo-class in existing open variant (#​15349)

Fixed

• Remove invalid min-w/h-none utilities (#​15845)
• Discard CSS variable shorthand utilities that don't use valid CSS variables (#​15738)
• Ensure font-size utilities with none modifier have a line-height set e.g. text-sm/none (#​15921)
• Ensure font-size utilities with unknown modifier don't generate CSS (#​15921)
• Don’t suggest font weight utilities more than once (#​15857)
• Suggest container query variants (#​15857)
• Disable bare value suggestions when not using the --spacing variable (#​15857)
• Ensure suggested classes are properly sorted (#​15857)
• Don’t look at .gitignore files outside initialized repos (#​15941)
• Find utilities when using the Svelte class shorthand syntax across multiple lines (#​15974)
• Find utilities when using the Angular class shorthand syntax (#​15974)
• Find utilities when using functions inside arrays (#​15974)
• Ensure that @tailwindcss/browser does not pollute the global namespace (#​15978)
• Ensure that tailwind-merge is not scanned when using the Vite plugin (#​16005)
• Ensure CSS theme variables are available within shadow roots (#​15975)
• Fix crash when project lives in the / directory (#​15988)
• Ensure custom variants have a non-empty selector list (#​16009)
• Upgrade: Ensure JavaScript config files on different drives are correctly migrated (#​15927)
• Upgrade: Migrate leading-[1] to leading-none (#​16004)
• Upgrade: Do not migrate arbitrary leading utilities to bare values (#​16004)

v4.0.0

Compare Source

Added

• New high-performance engine — where full builds are up to 5x faster, and incremental builds are over 100x faster — and measured in microseconds.
• Designed for the modern web — built on cutting-edge CSS features like cascade layers, registered custom properties with @property, and color-mix().
• Simplified installation — fewer dependencies, zero configuration, and just a single line of code in your CSS file.
• First-party Vite plugin — tight integration for maximum performance and minimum configuration.
• Automatic content detection — all of your template files are discovered automatically, with no configuration required.
• Built-in import support — no additional tooling necessary to bundle multiple CSS files.
• CSS-first configuration — a reimagined developer experience where you customize and extend the framework directly in CSS instead of a JavaScript configuration file.
• CSS theme variables — all of your design tokens exposed as native CSS variables so you can access them anywhere.
• Dynamic utility values and variants — stop guessing what values exist in your spacing scale, or extending your configuration for things like basic data attributes.
• Modernized P3 color palette — a redesigned, more vivid color palette that takes full advantage of modern display technology.
• Container queries — first-class APIs for styling elements based on their container size, no plugins required.
• New 3D transform utilities — transform elements in 3D space directly in your HTML.
• Expanded gradient APIs — radial and conic gradients, interpolation modes, and more.
• @​starting-style support — a new variant you can use to create enter and exit transitions, without the need for JavaScript.
• not-* variant — style an element only when it doesn't match another variant, custom selector, or media or feature query.
• Even more new utilities and variants — including support for color-scheme, field-sizing, complex shadows, inert, and more.

Start using Tailwind CSS v4.0 today by installing it in a new project, or playing with it directly in the browser on Tailwind Play.

For existing projects, we've published a comprehensive upgrade guide and built an automated upgrade tool to get you on the latest version as quickly and painlessly as possible.

For a deep-dive into everything that's new, check out the announcement post.

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