fix: pin tailwindcss to v3.4 to avoid v4 breaking changes

[UmakanthKaspa]

summary tailwind v4 removed the init command, causing npx tailwindcss init -p to fail with "could not determine executable to run" error.

pinning to v3.4 fixes this.

ref: https://github.com/tailwindlabs/tailwindcss/discussions/15820