security: fix all Medium findings from FLAWS_REPORT audit

- Auth: TOTP replay protection with counter tracking, constant-time
  backup code comparison, atomic lockout increment, per-token logout
- Invoices/PDFs: net-based VAT calculation, dangerous URL scheme
  stripping in cleanQuillHtml, orders-pdf error handling
- Orders: reject item changes on status transition, cascading
  delete cleanup, take:1 with orderBy
- Projects: atomic rename collision handling, MIME/extension
  validation, empty customer name rejection
- Attendance: Czech public holiday awareness in frontend fund
  calculation, leave_hours 0 handling, invalid date NaN guard,
  bounded per-month queries in workfund
- Users/Admin: profile audit logging + password validation, session
  revocation guard, session ID validation, dashboard DB aggregation,
  soft-deleted record protection in scope templates
- Frontend: FormField label linkage, Pagination ARIA, error
  handling in OrderConfirmationModal, 401 propagation, GPS emoji
  hidden from screen readers, table sort state fix, geolocation
  race/abort cleanup, Leaflet popup DOM safety, Vehicles toggleActive
  minimal body, CompanySettings ref mutation fix, OfferDetail unlock
  abort, AttendanceBalances combined fetches
- Utils: env validation, Puppeteer concurrency mutex, invoice alert
  cron cleanup on shutdown, body limit alignment, TOTP error logging,
  trustProxy from env, symlink rejection, rate cache Map usage

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/hooks/useTableSort.ts

@@ -1,4 +1,4 @@
-import { useState, useCallback, useRef } from "react";
+import { useState, useCallback } from "react";
 
 interface SortState {
   sort: string;
@@ -13,10 +13,10 @@ export default function useTableSort(
     sort: defaultSort,
     order: defaultOrder,
   });
-  const userClicked = useRef(false);
+  const [userClicked, setUserClicked] = useState(false);
 
   const handleSort = useCallback((column: string) => {
-    userClicked.current = true;
+    setUserClicked(true);
     setState((prev) => {
       if (prev.sort === column) {
         return { sort: column, order: prev.order === "asc" ? "desc" : "asc" };
@@ -25,7 +25,7 @@ export default function useTableSort(
     });
   }, []);
 
-  const activeSort = userClicked.current ? state.sort : null;
+  const activeSort = userClicked ? state.sort : null;
 
   return { sort: state.sort, order: state.order, handleSort, activeSort };
 }