refactor: fix all Low findings from FLAWS_REPORT audit

- Auth: TOTP params from config, JWT error logging, audit log failure
  logging, replaced_by_hash validation on token rotation
- Invoices: remove dead VAT code, consistent PDF permissions,
  WebP magic-byte detection, deduped exchange-rate fetches
- Orders/Offers: multipart limit from config, use paginated() helper,
  payment method from DB in PDF
- Projects: verify project exists before creating note
- Attendance: action_type enum validation, consistent local-time
  shift_date construction, holiday attendance in work fund,
  trips.view permission on last-km query
- Users: paginated() helper usage, remove duplicate dashboard keys,
  parallel currency conversion, single hashToken implementation
- Frontend: memoized customInput, reliable print onload, modal prop
  standardization (isOpen), ConfirmModal type icons, id===0 key
  fallback, Login useCallback, CompanySettings ConfirmModal,
  Attendance timeout cleanup, Dashboard memoization, beforeunload
  dirty-state warnings on Invoice/Offer/Order detail
- Schema: invoice_alert_log timestamp, config/env comment on
  Date.prototype.toJSON override
- Utils: exchange-rate inflight dedup

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

src/admin/pages/AttendanceAdmin.tsx

@@ -405,7 +405,7 @@ export default function AttendanceAdmin() {
 
       {/* Modals */}
       <BulkAttendanceModal
-        show={showBulkModal}
+        isOpen={showBulkModal}
         onClose={() => setShowBulkModal(false)}
         form={bulkForm}
         setForm={setBulkForm}
@@ -418,7 +418,7 @@ export default function AttendanceAdmin() {
 
       <ShiftFormModal
         mode="create"
-        show={showCreateModal}
+        isOpen={showCreateModal}
         onClose={() => setShowCreateModal(false)}
         onSubmit={handleCreateSubmit}
         form={createForm}
@@ -433,7 +433,7 @@ export default function AttendanceAdmin() {
 
       <ShiftFormModal
         mode="edit"
-        show={showEditModal && !!editingRecord}
+        isOpen={showEditModal && !!editingRecord}
         onClose={() => setShowEditModal(false)}
         onSubmit={handleEditSubmit}
         form={editForm}