fix(expenses): review follow-ups from #2333 (#2352)

- The owner's claimant key is trimmed and lower-cased, the same rule the
  payout RPC applies, so "Jakob" and "jakob " are one person with one
  Att göra row and one exact-amount match.
- The inbox pages through every registered claim (fetchAllRows) before
  pairing, so a long backlog can never understate a person's debt.
- A foreign receipt's VAT field is locked at 0 and 0 is what is submitted.
- Transport failures in the one-click and picker confirms show the
  destructive toast instead of failing silently.
- The open-claims flag is set only after the stale-fetch guard, and a
  payout match decrements the inbox count like every other row exit.
- Test: reset the live-link mock before the bank_line junction case.
- Wording: "Återbetalning av utlägg".

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

components/extensions/general/RegisterExpenseDialog.tsx

@@ -132,7 +132,9 @@ export default function RegisterExpenseDialog({ open, onOpenChange, item, payer,
   }, [open, payer, employeesLoaded])
 
   const amount = parseAmount(amountInput)
-  const vatAmount = parseAmount(vatInput)
+  // Foreign VAT is never deductible here: the field is locked and 0 is what
+  // gets submitted, whatever the extraction said.
+  const vatAmount = isForeign ? 0 : parseAmount(vatInput)
   const net = roundOre(amount - vatAmount)
   const employee = employees.find((e) => e.id === employeeId) ?? null
   const claimantName =
@@ -302,9 +304,9 @@ export default function RegisterExpenseDialog({ open, onOpenChange, item, payer,
               <Input
                 id="re-vat"
                 inputMode="decimal"
-                value={vatInput}
+                value={isForeign ? '0' : vatInput}
                 onChange={(e) => setVatInput(e.target.value)}
-                disabled={isSubmitting}
+                disabled={isSubmitting || isForeign}
                 className="tabular-nums"
               />
             </div>