chore: bump dev tooling to modern versions

Upgrade TypeScript 5→6, Vitest 0.32→4.1, Vite 4→8, @vitejs/plugin-react 4→6, @rollup/plugin-typescript 11→12, and Prettier 2→3. Add ignoreDeprecations:"6.0" to tsconfig to silence the node moduleResolution deprecation warning (rxfire subpath exports lack a types condition so bundler resolution breaks them).

Author: tyler-reitz