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/lib/queries/dashboard.ts

@@ -1,5 +1,4 @@
 import { queryOptions } from "@tanstack/react-query";
-import apiFetch from "../../utils/api";
 import { jsonQuery } from "../apiAdapter";
 
 export const dashboardOptions = () =>
@@ -28,11 +27,12 @@ export const sessionsOptions = () =>
   queryOptions({
     queryKey: ["sessions"],
     queryFn: async (): Promise<Session[]> => {
-      const response = await apiFetch("/api/admin/sessions");
-      const data = await response.json();
-      if (data.success) {
-        return Array.isArray(data.data) ? data.data : data.data?.sessions || [];
-      }
-      throw new Error(data.error || "Nepodařilo se načíst relace");
+      // Route through jsonQuery for the shared response.ok / 401 / non-JSON
+      // guards, then normalize the two possible payload shapes (a bare array
+      // or `{ sessions: [...] }`).
+      const data = await jsonQuery<Session[] | { sessions?: Session[] }>(
+        "/api/admin/sessions",
+      );
+      return Array.isArray(data) ? data : (data.sessions ?? []);
     },
   });