Enable imperative focus (microsoft#15863)

* Fix view.focus function

* Change files

* snapshots

Author: acoates-ms

change/react-native-windows-022762be-ce5e-4e62-81f6-0c234d69992e.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Fix view.focus function",
+  "packageName": "react-native-windows",
+  "email": "30809111+acoates-ms@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

packages/e2e-test-app-fabric/test/__snapshots__/PressableComponentTest.test.ts.snap

@@ -846,6 +846,13 @@ exports[`Pressable Tests Pressables can have event handlers, hover and click 2`]
         "Name": "pressOut",
         "TextRangePattern.GetText": "pressOut",
       },
+      {
+        "AutomationId": "",
+        "ControlType": 50020,
+        "LocalizedControlType": "text",
+        "Name": "focus",
+        "TextRangePattern.GetText": "focus",
+      },
       {
         "AutomationId": "",
         "ControlType": 50020,
@@ -891,6 +898,10 @@ exports[`Pressable Tests Pressables can have event handlers, hover and click 2`]
         "Type": "Microsoft.ReactNative.Composition.ParagraphComponentView",
         "_Props": {},
       },
+      {
+        "Type": "Microsoft.ReactNative.Composition.ParagraphComponentView",
+        "_Props": {},
+      },
     ],
   },
   "Visual Tree": {
@@ -991,6 +1002,18 @@ exports[`Pressable Tests Pressables can have event handlers, hover and click 2`]
           },
         ],
       },
+      {
+        "Offset": "11, 85, 0",
+        "Size": "874, 20",
+        "Visual Type": "SpriteVisual",
+        "__Children": [
+          {
+            "Offset": "0, 0, 0",
+            "Size": "874, 20",
+            "Visual Type": "SpriteVisual",
+          },
+        ],
+      },
     ],
   },
 }

vnext/Microsoft.ReactNative/ReactHost/ReactHost.cpp

@@ -266,6 +266,10 @@ class ReactNativeWindowsFeatureFlags : public facebook::react::ReactNativeFeatur
     return true;
   }
 
+  bool enableImperativeFocus() override {
+    return true;
+  }
+
   bool fuseboxEnabledRelease() override {
     return true; // Enable Fusebox (modern CDP backend) by default for React Native Windows
   }