[WIP] Support tailwind v4

[flozero]

'm not certain how well this library will work with Tailwind v4. However, after some discussions:

• tailwind v4 features clarification tailwindlabs/tailwindcss#14402
• tailwind v4 and tailwind merge tailwindlabs/tailwindcss#14400

It appears we'll need to change the generateSafeList function. Instead of adding classes in the Tailwind config, we'll need to build all the classes we use inside a CSS file.

Apart from this, everything should work well. We'll need to keep an eye on how tailwind-merge handles Tailwind v4. While we don't rely on it directly, it's a valuable addition to our library and the Tailwind ecosystem in general.

[flozero]

great news about tailwind merge dcastil/tailwind-merge#468

We can expect it to be available for v4