fix: resolve all 28 findings from the 2026-06-12 full audit (TDD-pinned)

Critical (data integrity):
- warehouse inventory confirm: throw (not return) inside $transaction so a
  failed deficit line rolls back the surplus corrective receipt — retries
  no longer accumulate phantom stock
- warehouse issue confirm: validate batches against the COMBINED quantity
  of all lines (duplicate FIFO-resolved lines drove batches negative)
- attendance delete: restore vacation_used/sick_used for the deleted day
  (in-transaction, clamped at 0)

High:
- auth refresh: terminated sessions (replaced_at only) get a plain 401 —
  the theft branch (family revocation) now fires only on replaced_by_hash
- POST /users strips role_id for non-admin callers (mirrors PUT guard)
- issued-order transition flushes unsaved edits via the full save payload
  when dirty; server contract (items+status in one PUT) pinned
- received-invoices list: usePaginatedQuery + pager (rows 26+ unreachable)
- received-invoice dates: nullableIsoDateString + NaN guard before NAS save
  (Czech-format dates corrupted month/year, orphaned NAS files)
- leave approval skips Czech public holidays and books each calendar year's
  hours against its own balance (mirrors createLeave)

Medium/Low (classes):
- 52 Zod caps aligned to DB column widths across 7 schemas (over-cap input
  500ed at Prisma instead of a Czech 400)
- FK pre-validation: projects update + warehouse receipts/issues return
  Czech 400s instead of P2003 500s
- invoice PDF degrades gracefully when the CNB rate is unavailable
  (recap omitted instead of 500 + lost NAS archival)
- date boundaries: local-day filters (warehouse lists/reports, audit-log),
  @db.Date coercion on invoice dates
- plan updateEntry re-checks the per-cell cap (self-excluding)
- {id} tiebreaks on customers/received-invoices/warehouse-items sorts;
  /items honors the client sort param
- htmlToPdf relaunches once when the shared browser died mid-render
- offer number release parses the year from the document number (cross-year
  finalize+delete left permanent sequence gaps)
- trips/vehicles km fields integer-coerced; AI budget regated to
  settings.company|settings.system; Settings System tab no longer clobbers
  Firma numbering patterns; draft invoices hide the dead PDF button;
  dashboard quick-trip invalidates ["vehicles"]; TOTP secret cap 64;
  audit-log + invoice month buckets day-shift fixes

Docs: corrected the stale "Chromium has no CSS margin-box footers" claim
(html-to-pdf.ts + CLAUDE.md — margin boxes render since Chrome 131); audit
report M3 withdrawn accordingly.

~65 new pinning tests; every finding reproduced RED against the real test
DB before its fix. Suite: 58 files / 634 tests green.

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

src/services/plan.service.ts

@@ -424,6 +424,7 @@ async function assertEntryCapAvailable(
   userId: number,
   dateFromStr: string,
   dateToStr: string,
+  excludeEntryId?: number,
 ): Promise<{ error: string; status: number } | null> {
   const from = toDateOnly(dateFromStr);
   const to = toDateOnly(dateToStr);
@@ -433,6 +434,9 @@ async function assertEntryCapAvailable(
       is_deleted: false,
       date_from: { lte: to },
       date_to: { gte: from },
+      // On update, the entry being moved must not count against itself —
+      // otherwise an unmoved at-cap entry would be uneditable.
+      ...(excludeEntryId !== undefined ? { id: { not: excludeEntryId } } : {}),
     },
     select: { date_from: true, date_to: true },
   });
@@ -587,6 +591,20 @@ export async function updateEntry(
     return { error: "Datum do musí být stejné nebo po datumu od", status: 400 };
   }
 
+  // Re-check the per-cell cap when the range changes — expanding onto a day
+  // already holding MAX_RECORDS_PER_CELL active entries would create a 4th
+  // that the grid (display-capped at 3) silently hides. The create paths
+  // guard this; the update path must too.
+  if (input.date_from || input.date_to) {
+    const capErr = await assertEntryCapAvailable(
+      existing.user_id,
+      fromStr,
+      toStr,
+      id,
+    );
+    if (capErr) return capErr;
+  }
+
   // Only validate the category when it actually changes — so editing just the
   // note of an entry whose category was later retired/hidden still saves.
   if (input.category && input.category !== existing.category) {