fix: 2026-06-09 full-codebase audit hardening

Validation: shared NaN-guarded Zod coercion helpers in schemas/common.ts replace
the raw number|string transform idiom across every schema (the root-cause NaN bug
class); emailOrEmpty + lenient isoDateString/timeString.

Security: roles privilege-escalation closed; refresh-token family revocation on
reuse; TOTP uses config params; read endpoints permission-guarded; received-invoices
gross VAT on all paths; orders-pdf custom-items authz.

Concurrency: $queryRaw SELECT...FOR UPDATE locks in ascending-id order (warehouse
confirm/cancel, attendance lockUserRow); uniqueness checks moved into create
transactions (TOCTOU -> 409); deterministic id tiebreak on second-precision
timestamp ordering (plan resolveCell/resolveGrid, warehouse FIFO).

Frontend: Rules-of-Hooks fixed across ~14 pages + PlanCellModal; UTC-date persisted
fields; dashboard invalidation gaps; stale-closure confirm bugs.

Tooling/tests: ESLint flat config (react-hooks/rules-of-hooks = error) + Prettier;
tsconfig.test.json so tsc -b type-checks the tests; removed 3 dead deps; npm audit
fix (8 -> 3). Suite 195 -> 247 (happy-path auth, FIFO oldest-first, flakiness fixes),
isolated on app_test via .env.test with a hard-throw setup guard.

Gates: tsc 0 | build 0 | vitest 247/247 | eslint 0 errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/AdminApp.tsx

@@ -81,6 +81,15 @@ export default function AdminApp() {
                   {import.meta.env.DEV && UiKit && (
                     <Route path="ui-kit" element={<UiKit />} />
                   )}
+                  {/*
+                    Auth gating is delegated to <AppShell>: every authenticated
+                    page is nested under this layout route, and AppShell
+                    redirects to /login when there is no user (per-page
+                    permission checks live in the pages themselves). NOTE: any
+                    NEW top-level route added OUTSIDE this <AppShell> wrapper
+                    (like `login`/`ui-kit` above) is PUBLIC by default — wrap it
+                    in AppShell or add its own guard if it needs auth.
+                  */}
                   <Route element={<AppShell />}>
                     <Route index element={<Dashboard />} />
                     <Route path="odin" element={<Odin />} />