Closes #44904 Adds the Tailwind CSS LSP as suggested here: https://github.com/zed-industries/zed/pull/39517#issuecomment-3368206678. This allows users to use the Tailwind CSS LSP for CSS files, to support Tailwind specific rules. Docs will be added in a separate PR after this is released Release Notes: - Add Tailwind CSS Mode support, for Tailwind specific CSS rules like `@apply`, `@layer`, and `@theme`.