Use useLoadingState hook in route files

[Valkyriezz]

Description

The useLoadingState hook in features/hooks.js handles showing and hiding the loading indicator. It's already used across the CRUD files, but none of the route files were using it. Instead, each route manually repeated the same useEffect with dispatch(showLoad()) / dispatch(hideLoad()).

This change replaces that duplicated pattern with the existing hook in 10 route files: homepage, accolade, accolist, identity, userpast, findpage, rankings, rarities, recently, and category.

Four routes — callback, campaign, addendum, and governor were left unchanged because their loading logic is more complex and doesn't fit the hook's pattern.

Closes #917