Adjust save button icon spacing for mobile screens

src/components/forms/invoice-form.tsx

@@ -789,12 +789,12 @@ export function InvoiceForm({ invoiceId }: InvoiceFormProps) {
         >
           {loading ? (
             <>
-              <Clock className="mr-2 h-4 w-4 animate-spin" />
+              <Clock className="h-4 w-4 animate-spin sm:mr-2" />
               <span className="hidden sm:inline">Saving...</span>
             </>
           ) : (
             <>
-              <Save className="mr-2 h-4 w-4" />
+              <Save className="h-4 w-4 sm:mr-2" />
               <span className="hidden sm:inline">Save Invoice</span>
             </>
           )}