UI architecture

RootLayout
└── Providers (SessionProvider + OnceUIProviders)
    ├── PublicShell          # / and /about
    ├── Login page
    └── DashboardShell       # authenticated product
        ├── DashboardSidebar
        ├── DashboardHeader
        └── page content

src/app/form/[id]/page.js        # default export FormPage + Suspense
└── FormPageContent             # local function, not a named page export
    └── FormWorkspace
        ├── step nav from question bank
        ├── GenericFormStep | step-specific components
        └── DuplicateFormModal / attestation / comments