chore: update samples metadata (with errors) [skip ci]

Author: github-actions[bot]

.metadata/errors.json

@@ -0,0 +1,10 @@
+{
+  "timestamp": "2026-06-20T18:22:11+02:00",
+  "commit": "d1a85e035a0e311e86b68a85f8023369c6ce6155",
+  "errors": [
+    {
+      "file": "samples/react-access-lens/assets/sample.json",
+      "error": "JSON decode error at line 1, column 1: Unexpected UTF-8 BOM (decode using utf-8-sig)"
+    }
+  ]
+}

.metadata/samples.json

@@ -4745,6 +4745,55 @@
             }
         ]
     },
+    {
+        "name": "pnp-sp-dev-spfx-extensions-react-site-content-ribbon-extension",
+        "source": "pnp",
+        "title": "Site Content Ribbon Extension",
+        "shortDescription": "Site Content Ribbon Extension is a SharePoint Framework Application Customizer for SharePoint Online that adds a ribbon-style “Site content” action to the SharePoint header and opens a modern, searchable experience for browsing site content directly from the current page.",
+        "url": "https://github.com/pnp/sp-dev-fx-extensions/tree/main/samples/react-site-content-ribbon-extension",
+        "longDescription": [
+            "Site Content Ribbon Extension is a SharePoint Framework Application Customizer for SharePoint Online that adds a ribbon-style “Site content” action to the SharePoint header and opens a modern, searchable experience for browsing site content directly from the current page."
+        ],
+        "creationDateTime": "2026-06-19",
+        "updateDateTime": "2026-06-19",
+        "products": [
+            "SharePoint"
+        ],
+        "metadata": [
+            {
+                "key": "CLIENT-SIDE-DEV",
+                "value": "React"
+            },
+            {
+                "key": "SPFX-VERSION",
+                "value": "1.23.0"
+            }
+        ],
+        "tags": [],
+        "categories": [
+            "SPFX-APPLICATION-EXTENSION"
+        ],
+        "thumbnails": [],
+        "authors": [
+            {
+                "gitHubAccount": "HarminderSethi",
+                "pictureUrl": "https://github.com/HarminderSethi.png",
+                "name": "Harminder Singh"
+            }
+        ],
+        "references": [
+            {
+                "name": "Overview of SharePoint Framework Extensions",
+                "description": "You can use SharePoint Framework (SPFx) Extensions to extend the SharePoint user experience. With SPFx Extensions, you can customize more facets of the SharePoint experience, including notification areas, toolbars, and list data views. SPFx Extensions are available in all Microsoft 365 subscriptions for production usage.",
+                "url": "https://learn.microsoft.com/sharepoint/dev/spfx/extensions/overview-extensions?WT.mc_id=m365-15741-cxa"
+            },
+            {
+                "name": "Use page placeholders from Application Customizer",
+                "description": "Application Customizers provide access to well-known locations on SharePoint pages that you can modify based on your business and functional requirements. For example, you can create dynamic header and footer experiences that render across all the pages in SharePoint Online.",
+                "url": "https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/using-page-placeholder-with-extensions?WT.mc_id=m365-15741-cxa"
+            }
+        ]
+    },
     {
         "name": "pnp-sp-dev-spfx-extensions-js-field-weather",
         "source": "pnp",