fix: check for owners sooner on manual entry

lib/ui/add_page/widgets/add_page.dart

@@ -195,11 +195,24 @@ class _AddPageState extends State<AddPage> {
                               theme.cardColor,
                             ),
                           ),
-                          onPressed: () => _formDialogBuilder(
+                          onPressed: () {
+                            if (widget.viewModel.currentOwner == null) {
+                              ScaffoldMessenger.of(context).showSnackBar(
+                                SnackBar(
+                                  content: Text(
+                                    "Attention : vous devez choisir un·e propriétaire",
+                                  ),
+                                  behavior: SnackBarBehavior.floating,
+                                ),
+                              );
+                            }
+
+                            _formDialogBuilder(
                               context,
                               controller,
                               widget.viewModel,
-                          ),
+                            );
+                          },
                           child: Text("Enregistrer manuellement"),
                         ),
                       ),

lib/ui/add_page/widgets/confirmation_popup.dart

@@ -1,5 +1,3 @@
-import 'dart:nativewrappers/_internal/vm/lib/ffi_patch.dart';
-
 import 'package:flutter/material.dart';
 import 'package:seshat/domain/models/book.dart';
 import 'package:seshat/ui/add_page/view_model/add_view_model.dart';