#154792 - CupertinoActionSheetAction cursor doesn't change to clickable on desktop (#158470)

This PR is for issue #154792 
The Video recording shows the before and after
The first button with the text "Go" uses the default cursor
The second button with the text "With Cursor" uses a custom cursor that has been passed in the parameters
https://github.com/user-attachments/assets/e82ecd42-42b1-42c9-aa30-a6f3daddb436

Here is the code for the second button
```dart
CupertinoButton(
    onPressed: () {
        showCupertinoModalPopup<void>(
            context: context,
            builder: (BuildContext context) {
                return CupertinoActionSheet(
                    title: const Text('The title'),
                    message: const Text('Message'),
                    actions: <Widget>[
                        CupertinoActionSheetAction(
                            cursor: SystemMouseCursors.forbidden,
                            child: const Text('One'),
                            onPressed: () {},
                        ),
                    ],
                );
            },
        );
    },
    child: const Text('With Cursor'),
),
```

Fixes https://github.com/flutter/flutter/issues/154792

packages/flutter/lib/src/cupertino/dialog.dart

@@ -1215,6 +1215,7 @@ class CupertinoActionSheetAction extends StatefulWidget {
     required this.onPressed,
     this.isDefaultAction = false,
     this.isDestructiveAction = false,
+    this.mouseCursor,
     required this.child,
   });
 
@@ -1234,6 +1235,12 @@ class CupertinoActionSheetAction extends StatefulWidget {
   /// Destructive buttons have red text.
   final bool isDestructiveAction;
 
+  /// The cursor that will be shown when hovering over the button.
+  ///
+  /// If null, defaults to [SystemMouseCursors.click] on web and
+  /// [MouseCursor.defer] on other platforms.
+  final MouseCursor? mouseCursor;
+
   /// The widget below this widget in the tree.
   ///
   /// Typically a [Text] widget.
@@ -1312,7 +1319,7 @@ class _CupertinoActionSheetActionState extends State<CupertinoActionSheetAction>
         + fontSize * _kActionSheetButtonVerticalPaddingFactor;
 
     return MouseRegion(
-      cursor: kIsWeb ? SystemMouseCursors.click : MouseCursor.defer,
+      cursor: widget.mouseCursor ?? (kIsWeb ? SystemMouseCursors.click : MouseCursor.defer),
       child: MetaData(
         metaData: this,
         behavior: HitTestBehavior.opaque,

packages/flutter/test/cupertino/action_sheet_test.dart

@@ -1956,6 +1956,44 @@ void main() {
     );
   });
 
+  testWidgets('CupertinoActionSheet action cursor behavior', (WidgetTester tester) async {
+    const SystemMouseCursor customCursor = SystemMouseCursors.grab;
+
+    await tester.pumpWidget(
+      createAppWithButtonThatLaunchesActionSheet(
+        CupertinoActionSheet(
+          title: const Text('The title'),
+          message: const Text('Message'),
+          actions: <Widget>[
+            CupertinoActionSheetAction(
+              mouseCursor: customCursor,
+              onPressed: () { },
+              child: const Text('One'),
+            ),
+          ],
+        ),
+      ),
+    );
+    await tester.tap(find.text('Go'));
+    await tester.pump();
+
+    final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
+    await gesture.addPointer(location: const Offset(10, 10));
+    await tester.pumpAndSettle();
+    expect(
+      RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1),
+      SystemMouseCursors.basic,
+   );
+
+    final Offset actionSheetAction = tester.getCenter(find.text('One'));
+    await gesture.moveTo(actionSheetAction);
+    await tester.pumpAndSettle();
+    expect(
+      RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1),
+      customCursor,
+    );
+  });
+
   testWidgets('Action sheets emits haptic vibration on sliding into a button', (WidgetTester tester) async {
     int vibrationCount = 0;