Upgrade to Tailwind4 (#16471)

## Test Plan

<img width="3360" alt="Screenshot 2025-03-03 at 10 01 19"
src="https://github.com/user-attachments/assets/d1ecfca0-ce51-440b-aabb-9107323fd1a4"
/>

.github/renovate.json5

@@ -58,12 +58,6 @@
       description: "Disable PRs updating GitHub runners (e.g. 'runs-on: macos-14')",
       enabled: false,
     },
-    {
-      // TODO: Remove this once the codebase is upgrade to v4 (https://github.com/astral-sh/ruff/pull/16069)
-      matchPackageNames: ["tailwindcss"],
-      matchManagers: ["npm"],
-      enabled: false,
-    },
     {
       // Disable updates of `zip-rs`; intentionally pinned for now due to ownership change
       // See: https://github.com/astral-sh/uv/issues/3642