refactor(representations): extract deterministic data-resolution helpers for representation flow (Slice R6, behaviour-preserving)
Related work items: #22441
refactor(representations): normalise shared type-selector and action-row fragments in main representation variants (Slice R5, behaviour-preserving)
Related work items: #22441
refactor(representations): separate representation page SSR loaders into lib/representation/pageLoaders (Slice R2, behaviour-preserving)
Related work items: #22441