feat(payments): betalfil UI (betalfil 3/3) (#1505)

* feat(payments): betalfil UI (betalfil 3/3)

Bulk-select + Skapa betalfil bulkbar on the supplier-invoices list,
preview dialog with per-line editable amount/date and exclusion reasons,
payment-files history page with re-download, cancel and a sequential
bulk mark-paid (duplicate guard respected, never forced), I betalfil
chip on rows in active batches, clearing/kontonummer fields on the
supplier form, and the supplier_payment_files namespace in sv+en.

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

* fix(sandbox): make the demo AP data betalfil-ready

Demo supplier bankgiro numbers were not Luhn-valid, the unpaid demo
invoice had remaining_amount 0 (no trigger derives it, so the list said
0 kr kvar att betala), and the company had no IBAN/BIC, all of which
excluded the seeded data from the betalfil flow. Numbers swapped for
Luhn-valid ones (991-2346 is Bankgirot's test number), a valid OCR added,
and both bulk-insert rows set remaining_amount explicitly per the
PostgREST normalization rule already documented inline.

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

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/api/schemas.ts

@@ -941,6 +941,8 @@ export const CreateSupplierSchema = z.object({
   bank_account: z.string().optional(),
   iban: z.string().optional(),
   bic: z.string().optional(),
+  clearing_number: z.string().optional(),
+  account_number: z.string().optional(),
   default_expense_account: accountNumber.optional(),
   default_payment_terms: z.number().int().positive().optional(),
   default_currency: CurrencySchema.nullable().optional(),