Bump tailwindcss from 3.4.3 to 4.1.12 in /frontend

[dependabot]

Bumps tailwindcss from 3.4.3 to 4.1.12.

Release notes

Sourced from tailwindcss's releases.

v4.1.12

Fixed

• Don't consider the global important state in @apply (#18404)
• Add missing suggestions for flex-<number> utilities (#18642)
• Fix trailing ) from interfering with extraction in Clojure keywords (#18345)
• Detect classes inside Elixir charlist, word list, and string sigils (#18432)
• Track source locations through @plugin and @config (#18345)
• Allow boolean values of process.env.DEBUG in @tailwindcss/node (#18485)
• Ignore consecutive semicolons in the CSS parser (#18532)
• Center the dropdown icon added to an input with a paired datalist by default (#18511)
• Extract candidates in Slang templates (#18565)
• Improve error messages when encountering invalid functional utility names (#18568)
• Discard CSS AST objects with false or undefined properties (#18571)
• Allow users to disable URL rebasing in @tailwindcss/postcss via transformAssetUrls: false (#18321)
• Fix false-positive migrations in addEventListener and JavaScript variable names (#18718)
• Fix Standalone CLI showing default Bun help when run via symlink on Windows (#18723)
• Read from --border-color-* theme keys in divide-* utilities for backwards compatibility (#18704)
• Don't scan .hdr and .exr files for classes by default (#18734)

v4.1.11

Fixed

• Add heuristic to skip candidate migrations inside emit(…) (#18330)
• Extract candidates with variants in Clojure/ClojureScript keywords (#18338)
• Document --watch=always in the CLI's usage (#18337)
• Add support for Vite 7 to @tailwindcss/vite (#18384)

v4.1.10

Fixed

• Fix incorrectly generated CSS when using percentages in arbitrary values with calc (e.g. w-[calc(100%-var(--offset))]) (#18289)

v4.1.9

Fixed

• Correctly parse custom properties with strings containing semicolons (#18251)
• Upgrade: Migrate arbitrary modifiers without percentage signs to bare values (e.g. /[0.16] → /16) (#18184)
• Upgrade: Migrate CSS variable shorthands where fallback value contains function call (#18184)
• Upgrade: Migrate negative arbitrary values to negative bare values (e.g. mb-[-32rem] → -mb-128) (#18212)
• Upgrade: Do not migrate blur in wire:model.blur (#18216)
• Don't add spaces around CSS dashed idents when formatting math expressions (#18220)

v4.1.8

Added

• Improve error messages when @apply fails (#18059)

Fixed

... (truncated)

Changelog

Sourced from tailwindcss's changelog.

[4.1.12] - 2025-08-13

Fixed

• Don't consider the global important state in @apply (#18404)
• Add missing suggestions for flex-<number> utilities (#18642)
• Fix trailing ) from interfering with extraction in Clojure keywords (#18345)
• Detect classes inside Elixir charlist, word list, and string sigils (#18432)
• Track source locations through @plugin and @config (#18345)
• Allow boolean values of process.env.DEBUG in @tailwindcss/node (#18485)
• Ignore consecutive semicolons in the CSS parser (#18532)
• Center the dropdown icon added to an input with a paired datalist by default (#18511)
• Extract candidates in Slang templates (#18565)
• Improve error messages when encountering invalid functional utility names (#18568)
• Discard CSS AST objects with false or undefined properties (#18571)
• Allow users to disable URL rebasing in @tailwindcss/postcss via transformAssetUrls: false (#18321)
• Fix false-positive migrations in addEventListener and JavaScript variable names (#18718)
• Fix Standalone CLI showing default Bun help when run via symlink on Windows (#18723)
• Read from --border-color-* theme keys in divide-* utilities for backwards compatibility (#18704)
• Don't scan .hdr and .exr files for classes by default (#18734)

[4.1.11] - 2025-06-26

Fixed

• Add heuristic to skip candidate migrations inside emit(…) (#18330)
• Extract candidates with variants in Clojure/ClojureScript keywords (#18338)
• Document --watch=always in the CLI's usage (#18337)
• Add support for Vite 7 to @tailwindcss/vite (#18384)

[4.1.10] - 2025-06-11

Fixed

• Fix incorrectly generated CSS when using percentages in arbitrary values with calc (e.g. w-[calc(100%-var(--offset))]) (#18289)

[4.1.9] - 2025-06-11

Fixed

• Correctly parse custom properties with strings containing semicolons (#18251)
• Upgrade: Migrate arbitrary modifiers without percentage signs to bare values (e.g. /[0.16] → /16) (#18184)
• Upgrade: Migrate CSS variable shorthands where fallback value contains function call (#18184)
• Upgrade: Migrate negative arbitrary values to negative bare values (e.g. mb-[-32rem] → -mb-128) (#18212)
• Upgrade: Do not migrate blur in wire:model.blur (#18216)
• Don't add spaces around CSS dashed idents when formatting math expressions (#18220)

[4.1.8] - 2025-05-27

Added

... (truncated)

Commits

• 6791e81 Prepare v4.1.12 release (#18728)
• 1855d68 Add --border-color to divide theme keys (#18704)
• 8e8a2d6 update @ampproject/remapping to @jridgewell/remapping (#18716)
• 68a79b1 Suggest bare values for flex-* utilities (#18642)
• fa3f45f Don’t output CSS objects with false or undefined in the AST (#18571)
• 939fda6 Show more specific error for functional-like but invalid utility names (#18568)
• 88b9f15 Center the dropdown icon added to an input with a paired datalist in Chrome (...
• 798a7bf Ignore consecutive semicolons in the CSS parser (#18532)
• 2941a7b Track source locations through @plugin and @config (#18329)
• 9169d73 update READMEs
• Additional commits viewable in compare view

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Project	Deployment	Preview	Updated (UTC)
pycon	Error		Aug 24, 2025 7:27pm

[marcoacierno]

@claude This PR is failing with

"Error: It looks like you're trying to use tailwindcss directly as a PostCSS plugin. The PostCSS plugin has moved to a separate package, so to continue using Tailwind CSS with PostCSS you'll need to install @tailwindcss/postcss and update your PostCSS configuration."

Fix it

[claude]

Claude finished @marcoacierno's task —— View job

---

Fixing Tailwind CSS v4 PostCSS Plugin Issue ✅

I've successfully fixed the PostCSS plugin issue caused by the Tailwind CSS v4 upgrade.

Todo List:

• Read current PostCSS configuration
• Install @tailwindcss/postcss dependency
• Update PostCSS configuration to use new plugin
• Test the build to ensure it works
• Commit and push changes

Changes Made:

1. Added @tailwindcss/postcss dependency in frontend/package.json

   • This is the new separate PostCSS plugin package required by Tailwind CSS v4

2. Updated PostCSS configuration in frontend/postcss.config.js

   • Changed from tailwindcss: {} to '@tailwindcss/postcss': {}

What was the issue?

Tailwind CSS v4 introduced a breaking change where the PostCSS plugin functionality was moved from the main tailwindcss package to a separate @tailwindcss/postcss package. The existing configuration was trying to use the main package as a PostCSS plugin, which is no longer supported.

The fix ensures compatibility with Tailwind CSS v4 while maintaining the same functionality. The changes have been committed and pushed to the PR branch for testing by the CI system.

---

[dependabot]

A newer version of tailwindcss exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.