fix: audit fix pass #1 — all 19 verified HIGH findings + critical dep cleanup

Fixes every CRITICAL/HIGH finding from the 2026-06-09 full-codebase audit
(REVIEW_FINDINGS.md); each fix went through independent spec + code-quality
review. Plan and per-task log: docs/superpowers/plans/2026-06-10-audit-high-fix-pass.md

- attendance: schemas accept the combined local datetimes the forms/service
  use (new dateTimeString helpers in schemas/common.ts), breaks persist on
  create, AttendanceCreate submit rebuilt — every submit 400'd since 519edce
- 2fa: backup codes wired to /totp/backup-verify (+ remember-me parity),
  enrollment QR generated locally via qrcode (CSP-blocked external service
  also leaked the secret), dashboard shows per-user enrollment, not policy
- invoices/orders: per-line VAT survives re-saves (numberOr 0-respecting
  coercion in formatters.ts), billing_text persists on update, issued-order
  status transitions update UI gates
- trips: real pagination on all 3 pages, GET /trips/stats server aggregate
  (shared buildTripsWhere + legacy distance coalesce), vehicle_id applies on
  PUT with both-vehicle odometer recompute, print rebuilt (sync window.open,
  escaped template, server totals)
- orders api: attachment_data PDF blob excluded from all non-binary reads
- warehouse: unit field is a Select over UnitEnum, receipt attachments
  downloadable via new authenticated GET route
- downloads: shared RFC 5987 contentDisposition helper — Czech filenames no
  longer 500 (warehouse, received-invoices, orders endpoints)
- misc: block-env hook actually blocks (exit 2 + stderr), project create
  works with empty dates, NaN filter guards on trips endpoints
- deps: remove unused concurrently (clears both critical advisories), pin
  @hono/node-server >=1.19.13 via overrides (clears the 3 moderates without
  the Prisma 6 downgrade), drop deprecated @types stubs

Gates: tsc -b clean - vitest 30 files / 342 tests (31 new) - eslint 0 errors
- build OK

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/services/numbering.service.ts

@@ -206,8 +206,16 @@ async function releaseSequence(
 /** Verify a shared number is not already used by an order or project. */
 export async function isSharedNumberTaken(number: string): Promise<boolean> {
   const [existingOrder, existingProject] = await Promise.all([
-    prisma.orders.findFirst({ where: { order_number: number } }),
-    prisma.projects.findFirst({ where: { project_number: number } }),
+    // select id only — the orders row carries the PO attachment blob, which an
+    // existence check must never pull.
+    prisma.orders.findFirst({
+      where: { order_number: number },
+      select: { id: true },
+    }),
+    prisma.projects.findFirst({
+      where: { project_number: number },
+      select: { id: true },
+    }),
   ]);
   return !!(existingOrder || existingProject);
 }
@@ -238,8 +246,11 @@ export async function isOfferNumberTaken(number: string): Promise<boolean> {
 
 /** Verify an order number is not already used. */
 export async function isOrderNumberTaken(number: string): Promise<boolean> {
+  // select id only — the orders row carries the PO attachment blob, which an
+  // existence check must never pull.
   const existing = await prisma.orders.findFirst({
     where: { order_number: number },
+    select: { id: true },
   });
   return !!existing;
 }