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/routes/admin/sessions.ts

@@ -86,6 +86,7 @@ export default async function sessionsRoutes(
     { preHandler: requireAuth },
     async (request, reply) => {
       const id = parseInt(request.params.id, 10);
+      if (Number.isNaN(id)) return error(reply, "Neplatné ID relace", 400);
       const authData = request.authData!;
 
       const session = await prisma.refresh_tokens.findFirst({
@@ -111,11 +112,15 @@ export default async function sessionsRoutes(
       const currentToken = request.cookies?.refresh_token;
       const currentHash = currentToken ? hashToken(currentToken) : null;
 
+      if (!currentHash) {
+        return error(reply, "Nelze identifikovat aktuální relaci", 400);
+      }
+
       await prisma.refresh_tokens.updateMany({
         where: {
           user_id: authData.userId,
           replaced_at: null,
-          ...(currentHash ? { token_hash: { not: currentHash } } : {}),
+          token_hash: { not: currentHash },
         },
         data: { replaced_at: new Date() },
       });