MARS-77 Sidebar/navbar per-role regroup (Stage A): execute the holistic restructure the /sidebars-preview diagnostic (75ad66f, 2026-06-04) was built to inform. Per-role nav still cluttered/inconsistent. Use the preview tool (renders real sidebar per role side-by-side) to design grouping, then regroup. Only piecemeal edits landed since (MARS-33/34, WI#327, WI#214); holistic cleanup dropped + untracked until now (Elazar 06-09).