Rename toast-headers to notification-headers, add progress bar test code

- toast-headers -> notification-headers: rename, update all cross-refs and
  redirects, update upstream redirect chain
- Add arguments comment to header activation snippet
- Update test project with progress bar validation buttons (11-12)

Co-authored-by: Copilot <[email protected]>

Author: drewbatgit

.openpublishing.redirection.json

@@ -9545,6 +9545,11 @@
       "redirect_url": "notification-collections",
       "redirect_document_id": true
     },
+    {
+      "source_path": "hub/apps/develop/notifications/app-notifications/toast-headers.md",
+      "redirect_url": "notification-headers",
+      "redirect_document_id": true
+    },
     {
       "redirect_document_id": false
     },
@@ -9615,7 +9620,7 @@
     },
     {
       "source_path": "hub/apps/design/shell/tiles-and-notifications/toast-headers.md",
-      "redirect_url": "../../../develop/notifications/app-notifications/toast-headers",
+      "redirect_url": "../../../develop/notifications/app-notifications/notification-headers",
       "redirect_document_id": false
     },
     {

hub/apps/develop/notifications/app-notifications/app-notifications-content.md

@@ -309,7 +309,7 @@ You can group notifications under headers within Notification Center. For exampl
 
 ![A screenshot of a action center showing multiple notifications for the application Notifications Viewer organized under a header labeled "Camping!".](images/toast-content-headers.png)
 
-To learn more about using headers, please see [Toast headers](toast-headers.md).
+To learn more about using headers, please see [App notification headers](notification-headers.md).
 
 
 ## Adaptive content

hub/apps/develop/notifications/app-notifications/index.md

@@ -37,7 +37,7 @@ This section provides design and implementation guidance for app notifications i
 - [App notification with pending update activation](toast-pending-update.md)
 - [Custom timestamps on app notifications](custom-timestamps-on-toasts.md)
 - [App notification collections](notification-collections.md)
-- [App notification headers](toast-headers.md)
+- [App notification headers](notification-headers.md)
 - [Notification listener: Access all notifications](notification-listener.md)
 
 ## Limitations

hub/apps/develop/notifications/app-notifications/notification-collections.md

@@ -12,7 +12,7 @@ ms.localizationpriority: medium
 
 Use collections to organize your app's notifications in Notification Center. Collections help users locate information more easily and allow developers to better manage their notifications.
 
-A messaging app, for example, can separate notifications by chat group. Each group title ("Comp Sci 160A Project Chat", "Direct Messages", "Lacrosse Team Chat") is a separate collection. Notifications are grouped as if they were from a separate app, even though they all come from the same app. For a more subtle way to organize notifications, see [App notification headers](toast-headers.md).
+A messaging app, for example, can separate notifications by chat group. Each group title ("Comp Sci 160A Project Chat", "Direct Messages", "Lacrosse Team Chat") is a separate collection. Notifications are grouped as if they were from a separate app, even though they all come from the same app. For a more subtle way to organize notifications, see [App notification headers](notification-headers.md).
 
 ![Collection Example with two different Groups of Notifications](images/toast-collection-example.png)
 

…tions/app-notifications/toast-headers.md …pp-notifications/notification-headers.mdhub/apps/develop/notifications/app-notifications/toast-headers.md renamed to hub/apps/develop/notifications/app-notifications/notification-headers.md hub/apps/develop/notifications/app-notifications/toast-headers.md renamed to hub/apps/develop/notifications/app-notifications/notification-headers.md

@@ -53,7 +53,8 @@ Activation from a header is handled through the [**NotificationInvoked**](/windo
 ```csharp
 AppNotificationManager.Default.NotificationInvoked += (sender, args) =>
 {
-    // Arguments specified from the header
+    // For the header defined above, args.Argument contains:
+    // "action=openConversation&id=6289"
     string arguments = args.Argument;
 };
 ```

hub/apps/develop/toc.yml

@@ -477,7 +477,7 @@ items:
           - name: Collections
             href: notifications/app-notifications/notification-collections.md
           - name: Headers
-            href: notifications/app-notifications/toast-headers.md
+            href: notifications/app-notifications/notification-headers.md
           - name: Notification Listener
             href: notifications/app-notifications/notification-listener.md
       - name: Notification delivery methods