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>
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