Fix stock-out boot, transfer 500, Clear buttons and uncaught engine errors

Return JSON from any uncaught engine exception, stop the empty stock-out warehouse list aborting page boot, reject non-transfer rows in the transfer lookup, define the missing reset_input helper, and remove a stale unreferenced copy of confirm_order.php.

app/accounting/manage_account.php

@@ -222,7 +222,7 @@
       autoPrepare: true,
       checkRequired: 0,
       action: 'read',
-      data: { id: <?php echo (int)$_GET['id']; ?> },
+      data: { id: <?php echo (int)($_GET['id'] ?? 0); ?> },
       onSuccess: function(res) {
         var item = res.output;
         $('#id').val(item.id);

app/accounting/manage_department.php

@@ -89,7 +89,7 @@
       autoPrepare: true,
       checkRequired: 0,
       action: 'read',
-      data: { id: <?php echo (int)$_GET['id']; ?> },
+      data: { id: <?php echo (int)($_GET['id'] ?? 0); ?> },
       onSuccess: function(res) {
         var item = res.output;
         $('#id').val(item.id);