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/routes/admin/received-invoices.ts

@@ -6,6 +6,7 @@ import prisma from "../../config/database";
 import { requirePermission } from "../../middleware/auth";
 import { logAudit } from "../../services/audit";
 import { success, error, parseId, paginated } from "../../utils/response";
+import { contentDisposition } from "../../utils/content-disposition";
 import { parsePagination, buildPaginationMeta } from "../../utils/pagination";
 import { parseBody } from "../../schemas/common";
 import {
@@ -294,10 +295,14 @@ export default async function receivedInvoicesRoutes(
       if (!nasFile) return error(reply, "Soubor na NAS nenalezen", 404);
 
       const mime = invoice.file_mime || "application/pdf";
-      const safeFileName = invoice.file_name.replace(/[\r\n"]/g, "");
+      // "inline": the FE (ReceivedInvoices.openFile) opens this in a new
+      // window for viewing, not as a forced download.
       return reply
         .type(mime)
-        .header("Content-Disposition", `inline; filename="${safeFileName}"`)
+        .header(
+          "Content-Disposition",
+          contentDisposition("inline", invoice.file_name),
+        )
         .send(nasFile.data);
     },
   );