feat(cart): implement cart editing policy with granular permissions

src/app/shared/components/cart/cart.component.html

@@ -6,7 +6,7 @@
     <h2 class="m-0 text-uppercase fw-bold cart-title">{{ title() }}</h2>
 
     <div class="d-flex align-items-center cart-header-actions">
-      @if (!readonly() && editable() && allowEditing() && items().length > 0) {
+      @if (!readonly() && allowModify() && requireEditingMode() && items().length > 0) {
         <button
           class="btn btn-link p-0 border-0 cart-edit-btn"
           type="button"
@@ -48,8 +48,22 @@
         [selectedVariant]="getItemVariant(item)"
         [quantity]="getItemQuantity(item)"
         [readonly]="readonly()"
-        [quantityDisabled]="!editable() || editingDisabled() || (allowEditing() && !editing())"
-        [showRemove]="allowRemove()"
+        [quantityDisabled]="
+          readonly() ||
+          !allowUpdateQuantity() ||
+          editingDisabled() ||
+          (requireEditingMode() && !editing())
+        "
+        [variantDisabled]="
+          readonly() ||
+          !allowUpdateVariant() ||
+          editingDisabled() ||
+          (requireEditingMode() && !editing())
+        "
+        [removeDisabled]="
+          readonly() || !allowDelete() || editingDisabled() || (requireEditingMode() && !editing())
+        "
+        [allowDelete]="allowDelete()"
         (quantityChange)="onItemQuantityChange(idx, $event)"
         (variantChange)="onItemVariantChange(idx, $event)"
         (remove)="onItemRemove(idx)"