Update UI Components to use React 19 and Tailwind 4

[0x0f0f0f]

Close #1000

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[Copilot]

Pull Request Overview

This PR updates the UI Components app to use React 19 and Tailwind CSS v4, modernizing the development stack and improving component implementations. The update includes comprehensive changes to package dependencies, PostCSS configuration, and component patterns while maintaining compatibility with the existing API.

• Update from React 18 to React 19 and Tailwind CSS v3 to v4
• Refactor all components from forwardRef pattern to standard function components
• Migrate from individual Radix imports to scoped packages with proper TypeScript support

Reviewed Changes

Copilot reviewed 32 out of 33 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Updates React to v19, Tailwind to v4, adds new Radix packages and dev dependencies
postcss.config.mjs	Updates PostCSS plugin from tailwindcss to @tailwindcss/postcss for v4 compatibility
tailwind.config.ts	Removes entire Tailwind v3 configuration (replaced by v4's built-in defaults)
app/globals.css	Complete rewrite for Tailwind v4 syntax with new color system and theme configuration
components/ui/*.tsx	Refactors UI components to remove forwardRef and update styling classes
registry/components/*.tsx	Updates custom components to use standard function syntax and new Tailwind classes

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[printerscanner]

This is looking very very good @0x0f0f0f. There is still one issue with the search bar that we talked about where the bar closes automatically only sometimes, but that can be handled in a different pull request.

[printerscanner]

@0x0f0f0f I think we might want to update the workflow editor before we merge the PR? Only because it is so prominently displayed on the UI section.

[0x0f0f0f]

@0x0f0f0f I think we might want to update the workflow editor before we merge the PR? Only because it is so prominently displayed on the UI section.

Making a PR