docs: add manage promotions in cart storefront guide (#13483)

* docs: add manage promotions in cart storefront guide

* fix incorrect cURL example

www/apps/resources/generated/edit-dates.mjs

@@ -6573,6 +6573,7 @@ export const generatedEditDates = {
   "app/troubleshooting/scheduled-job-not-running/page.mdx": "2025-08-29T11:32:54.117Z",
   "app/troubleshooting/pnpm/page.mdx": "2025-08-29T12:21:24.692Z",
   "app/how-to-tutorials/tutorials/product-feed/page.mdx": "2025-09-01T13:19:59.335Z",
+  "app/storefront-development/cart/manage-promotions/page.mdx": "2025-09-11T14:11:40.904Z",
   "app/recipes/ticket-booking/examples/page.mdx": "2025-09-10T14:11:55.063Z",
   "app/recipes/ticket-booking/examples/storefront/page.mdx": "2025-09-10T14:14:44.005Z",
   "app/recipes/ticket-booking/example/page.mdx": "2025-09-10T15:13:15.604Z",

www/apps/resources/generated/files-map.mjs

@@ -1183,6 +1183,10 @@ export const filesMap = [
     "filePath": "/www/apps/resources/app/storefront-development/cart/manage-items/page.mdx",
     "pathname": "/storefront-development/cart/manage-items"
   },
+  {
+    "filePath": "/www/apps/resources/app/storefront-development/cart/manage-promotions/page.mdx",
+    "pathname": "/storefront-development/cart/manage-promotions"
+  },
   {
     "filePath": "/www/apps/resources/app/storefront-development/cart/retrieve/page.mdx",
     "pathname": "/storefront-development/cart/retrieve"

www/apps/resources/generated/generated-commerce-modules-sidebar.mjs

@@ -1227,6 +1227,14 @@ const generatedgeneratedCommerceModulesSidebarSidebar = {
               "path": "https://docs.medusajs.com/resources/storefront-development/guides/express-checkout",
               "children": []
             },
+            {
+              "loaded": true,
+              "isPathHref": true,
+              "type": "ref",
+              "title": "Manage Cart Promotions in Storefront",
+              "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-promotions",
+              "children": []
+            },
             {
               "loaded": true,
               "isPathHref": true,
@@ -13508,6 +13516,26 @@ const generatedgeneratedCommerceModulesSidebarSidebar = {
             }
           ]
         },
+        {
+          "loaded": true,
+          "isPathHref": true,
+          "type": "category",
+          "title": "Storefront Guides",
+          "autogenerate_tags": "storefront+promotion,-jsSdk",
+          "autogenerate_as_ref": true,
+          "sort_sidebar": "alphabetize",
+          "description": "Learn how to integrate the Promotion Module's features into your storefront.",
+          "children": [
+            {
+              "loaded": true,
+              "isPathHref": true,
+              "type": "ref",
+              "title": "Manage Cart Promotions in Storefront",
+              "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-promotions",
+              "children": []
+            }
+          ]
+        },
         {
           "loaded": true,
           "isPathHref": true,

www/apps/resources/generated/generated-storefront-development-sidebar.mjs

@@ -294,6 +294,14 @@ const generatedgeneratedStorefrontDevelopmentSidebarSidebar = {
           "title": "Manage Line Items",
           "children": []
         },
+        {
+          "loaded": true,
+          "isPathHref": true,
+          "type": "link",
+          "path": "/storefront-development/cart/manage-promotions",
+          "title": "Manage Promotions",
+          "children": []
+        },
         {
           "loaded": true,
           "isPathHref": true,