Decouple fetching and render logic via react-router v6 data router loader APIs

[chownces]

Continuation of react-router v6 migration to new 'data router' APIs.

• shift to new loader APIs
• decouple fetching from rendering logic
• https://stackoverflow.com/questions/75383036/is-there-a-way-to-use-react-redux-dispatch-inside-the-loader-function-of-react-r