fix: add @tailwindcss/cli to bundle css properly

[pqoqubbw]

Summary

pnpm i
pnpm build

Test Plan

---

Note

Ensures the package publishes compiled CSS alongside JS outputs.

• Updates build script to run pnpm build:css and adds build:css using @tailwindcss/cli to compile src/styles.css to dist/styles.css (minified)
• Adds @tailwindcss/cli as a dev dependency and updates lockfile

^{Written by Cursor Bugbot for commit 165e4d6. This will update automatically on new commits. Configure here.}