Fix edit invoice initialization and routing

The form initialization logic for editing invoices was improved to
handle route changes correctly. The edit link path was fixed and cache
invalidation was added to ensure fresh data on navigation.

src/app/dashboard/invoices/[id]/page.tsx

@@ -131,7 +131,7 @@ function InvoiceViewContent({ invoiceId }: { invoiceId: string }) {
       >
         <PDFDownloadButton invoiceId={invoice.id} variant="outline" />
         <Button asChild variant="default">
-          <Link href={`/dashboard/invoices/${invoice.id}`}>
+          <Link href={`/dashboard/invoices/${invoice.id}/edit`}>
             <Edit className="h-5 w-5" />
             <span>Edit</span>
           </Link>