- Add UserRole type and AppUser interface to types.ts
- Create UserContext with useUser() hook providing role-based permission booleans
- Split App into App (auth wrapper) + AppContent (uses UserContext)
- Update Sidebar to filter nav items by UserRole instead of boolean isAdmin
- Add User Management nav item (super_admin only)
- Add AgencyFilterBar component for oversight_admin/super_admin session-level filtering
- Pass agencyId to getCampaigns, getAnalytics, audit endpoints in apiService
- Add getMe, getUsers, updateUser, createAgency to apiService
- Build UserManagement page with user table (role/agency dropdowns) and agency CRUD
- Add readOnly prop to Campaigns (hides create/delete/status-toggle for oversight_admin)
- Add readOnly prop to Settings (disables all ManagementCards, shows view-only banner)
- Pass agencyId to Analytics component for filtered data
- Update urlState with Knowledge Base and User Management views
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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