Added checkbox in stock page

src/app/pages/stock/stock.html

@@ -1,9 +1,9 @@
 <div class="flex mt-2">
-    @if (hasSelection) {
+    @if (productIds.length) {
         <app-modal-button #modalButtonPurchaseOrder
                           (click)="openPurchaseOrderForm()"
-                          (ok)="onModalOk()"
-                          (cancel)="onModalCancel()"
+                          (ok)="onModalPurchaseOrderOk()"
+                          (cancel)="onModalPurchaseOrderCancel()"
                           type="default"
                           name="Créer un bon de commande"
                           size="35%"
@@ -21,9 +21,22 @@
                           (cancel)="onModalQuotationCancel()">
             <app-create-quotation-form #quotationForm></app-create-quotation-form>
         </app-modal-button>
+
+        <app-modal-button #modalButtonSupplier
+                          type="default"
+                          name="Associer à un fournisseur"
+                          size="35%"
+                          class="ml-4"
+                          (click)="openSupplierForm()"
+                          (ok)="onModalSupplierOk()"
+                          (cancel)="onModalSupplierCancel()">
+            <app-add-product-supplier-form #supplierForm></app-add-product-supplier-form>
+        </app-modal-button>
     }
 </div>
 
 <div class="mt-4">
-    <app-stock-table #stockTable (selectionChange)="onSelectionChange($event)"></app-stock-table>
+    <app-stock-table (selectionChange)="productIds = $event"
+                     (productsTables)="products.set($event)">
+    </app-stock-table>
 </div>