Update to Waku 1.0.0-rc.1

Update to Waku 1.0.0-rc.1

Waku moves from 1.0.0-rc.0 to 1.0.0-rc.1, which pins its React peers to ~19.3.0.

fumapress now requires react and react-dom ^19.3.0. Upgrade React alongside this release:

npm i react@^19.3.0 react-dom@^19.3.0

Projects created with create-fumapress are scaffolded with React 19.3 already.