Part of #1946 — Redux → React Query migration (Stage 1). Part of the #1976 courseware decomposition (plan) — fast-follow to #2008, stacked directly above the de-class and below the RQ peels (#2010+).

Goal: convert src/courseware/CoursewareContainer.jsx to .tsx immediately after it's de-classed (#2008), so the courseware React Query peels all happen in TypeScript-land.

Why a separate PR from #2008: the de-class is already a churn-y structural diff; layering a rename + type annotations on top makes it harder to review. Keeping them as two stacked PRs lets each review as a single idea.

Approach — don't type the doomed Redux stuff. The Redux-sourced selectors (currentCourseSelector, etc.) and the redirect-helper positional args are about to be deleted/replaced by the RQ peels, so type them loosely (any/minimal) now and fill in real types per-peel as each selector becomes a typed useQuery return.

Tasks

• Rename CoursewareContainer.jsx → .tsx; add the minimum annotations to compile.
• any/loose-type the Redux-sourced values as needed (in practice reselect infers the redirect helpers + createSelector selectors, so only the two internal refs need useRef<any>).

Add a reusable AppDispatch type + useAppDispatch hook to src/store.ts — dropped. Typed thunk dispatch only serves the Redux we're deleting (RQ code doesn't dispatch), and plain useDispatch() type-checks fine since the thunks are still JS. store.ts is left untouched. See the PR decision log.

Verify: npm run types + npm run lint clean; CoursewareContainer.test.jsx still green; no behavior change.

Scoped-but-light; a full plan gets added when this is picked up.