feat(supplier-invoices): Inlagd i banken mark for payments entered by hand (#2220) (#2356)

A user who types payments into the internet bank instead of uploading a
betalfil had no way to see which invoices were already handled. Adds a
nullable supplier_invoices.bank_entered_at, a POST
/api/supplier-invoices/{id}/bank-entered route, a labelled checkbox on
the list (trailing slot, once attested) and on the detail header, and a
BEFORE UPDATE trigger that clears the mark when a payment lands, so
every payment path (mark-paid, bank match, v1, MCP) retires it without
knowing it exists. Markera som betald stays a separate action.


Claude-Session: https://claude.ai/code/session_01LvMaHcTnwAfxzgYD1fGYX1

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

types/index.ts

@@ -1224,6 +1224,13 @@ export interface SupplierInvoice {
   // creation and mark-paid is rejected by the existing status guard.
   paid_with_private_funds: boolean
 
+  /**
+   * "Inlagd i banken" (#2220): the user entered this payment in the internet
+   * bank by hand; money not yet gone. A mellanlage between attesterad and
+   * betald, never a status. Cleared by a DB trigger when a payment lands.
+   */
+  bank_entered_at: string | null
+
   notes: string | null
 
   // Default dimensions bag ({sie_dim_no: code}, e.g. {"1":"KS01","6":"P001"})