v1.0.3 — dependency maintenance

Dependency maintenance — no editor or server behavior changes.

Changed

• Dev toolchain majors via Dependabot: TypeScript 5→6, Vite 5→8, Vitest 2→4, @types/node 20→26, tsx 4.23.
• CI actions: actions/checkout 4→7, actions/setup-node 4→6, actions/upload-artifact 4→7.

Full details in CHANGELOG.md.