feat(frontend): add typed Redux hooks and migrate components #2077
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The codebase had a TODO recommending typed hooks for Redux (see store.ts). Using untyped useDispatch() risks losing type information and causes boilerplate (casting). Providing centralized typed hooks (useAppDispatch/useAppSelector) improves developer ergonomics, reduces type errors, and makes future frontend contributions safer and easier to review.
The change is small and low-risk, making it a good first contribution: it removes a TODO and modernizes a part of the frontend without changing runtime behavior.