Bump vite to v8

Align the direct Vite dependency with vite-node 6 and deduplicate the Vite installation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 242d13c2-f0f3-425a-9def-6bf22c1bbb4e

Author: cklin