feat(invoices): implement öresavrundning logic and next invoice numbe… (#429)

* feat(invoices): implement öresavrundning logic and next invoice number preview

- Added `getDisplayTotal` utility to handle rounding for SEK invoices based on company settings.
- Updated `InvoicesPage` to utilize the new rounding logic when displaying totals.
- Introduced `peek_next_invoice_number` function to allow previewing the next invoice number without consuming the sequence.
- Modified invoice number generation to remove the year prefix and prevent truncation of numbers exceeding three digits.
- Enhanced tests for invoice number generation and rounding functionality to ensure correctness.
- Updated PDF template to reflect new rounding logic for totals and display appropriate values.
- Adjusted company switcher to hide options in sandbox mode.
- Improved error handling and logging in sandbox seeding process.

* fix(skatteverket): remove unused scope labels from SCOPE_LABELS and DEFAULT_SCOPES

components/invoices/InvoiceReviewContent.tsx

@@ -25,6 +25,9 @@ interface InvoiceReviewContentProps {
   yourReference?: string
   ourReference?: string
   notes?: string
+  /** The invoice number that will be assigned on confirm. Null when unknown
+   *  (e.g. delivery notes use a different sequence) or unfetched. */
+  numberPreview?: string | null
 }
 
 export function InvoiceReviewContent({
@@ -39,6 +42,7 @@ export function InvoiceReviewContent({
   yourReference,
   ourReference,
   notes,
+  numberPreview,
 }: InvoiceReviewContentProps) {
   const customerTypeLabel: Record<string, string> = {
     individual: 'Privatperson',
@@ -60,6 +64,12 @@ export function InvoiceReviewContent({
 
   return (
     <div className="space-y-4">
+      {numberPreview && (
+        <div className="text-sm text-muted-foreground">
+          Tilldelas fakturanummer{' '}
+          <span className="font-medium tabular-nums text-foreground">{numberPreview}</span>
+        </div>
+      )}
       {/* Customer info */}
       <div className="bg-muted rounded-lg p-3 sm:p-4 flex flex-col sm:flex-row sm:items-center gap-2 sm:justify-between">
         <div className="min-w-0">