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/context/AuthContext.tsx

@@ -122,7 +122,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
       }
     },
     [],
-  ); // eslint-disable-line react-hooks/exhaustive-deps
+  );  
 
   const silentRefresh = useCallback(async (): Promise<boolean> => {
     // Deduplicate concurrent refresh calls — token rotation means only one call can succeed
@@ -315,6 +315,14 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     }
   }, [getAccessTokenFn]);
 
+  // NOTE: this is a SECOND 401-refresh-and-retry path that parallels
+  // `apiFetch` in src/admin/utils/api.ts (which most pages use via the query
+  // helpers). The two diverge: `apiRequest` ignores AbortSignals and does NOT
+  // set the session-expired flag, whereas `apiFetch` dedupes concurrent
+  // refreshes, honors abort, and surfaces the 499 session-expired sentinel.
+  // Consolidating onto `apiFetch` is a tracked follow-up but is deferred here
+  // because it touches the core auth/refresh flow (high regression risk). If
+  // you change refresh/retry semantics in one, mirror it in the other.
   const apiRequest = useCallback(
     async (endpoint: string, options: RequestInit = {}) => {
       let token = getAccessTokenFn();