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/components/PlanRangeChips.tsx

@@ -4,17 +4,18 @@ import type { Project } from "../lib/queries/projects";
 interface Props {
   cell: ResolvedCell | null;
   project: Project | null;
-  readonly?: boolean;
   categoryLabel: string;
 }
 
+// Purely presentational — renders the category/project chips and note for a
+// single resolved plan cell. It has no interactive handlers of its own (the
+// click target is the cell <button> in PlanGrid, which already applies the
+// read-only styling/behaviour), so there is no read-only state to gate here.
 export default function PlanRangeChips({
   cell,
   project,
-  readonly,
   categoryLabel,
 }: Props) {
-  void readonly;
   if (!cell) return null;
   // Prefer the server-embedded project label (always present). Fall back to
   // the looked-up `project` prop only if the cell predates the embed (stale