fix: override vite to ^8.0.1 to resolve ERR_PACKAGE_PATH_NOT_EXPORTED CI failure

vitest pulled in vite 7.x via npm workspace hoisting, causing
@vitejs/plugin-react 6.x to fail when importing vite/internal
(only exported in vite 8.x). Adding the override forces all
transitive vite deps to resolve to ^8.0.1.

Author: atomantic