feat: add custom signature image and signer details support to invoices and settings

app/Models/Invoice.php

@@ -21,6 +21,7 @@ class Invoice extends Model
         'subtotal', 'tax_rate', 'tax_amount', 'total', 'currency',
         'status', 'issue_date', 'due_date', 'paid_date', 'notes',
         'bank_name', 'bank_account', 'bank_holder', 'branch_name',
+        'signature_image',
     ];
 
     protected $casts = [

app/Models/InvoiceSettings.php

@@ -25,6 +25,9 @@ class InvoiceSettings extends Model
         'default_bank_account',
         'default_bank_holder',
         'default_notes',
+        'signature_image',
+        'signer_name',
+        'signer_title',
     ];
 
     protected $casts = [