opt nested scroll

Signed-off-by: dom <githubaccount56556@proton.me>

lib/utils/extension/nested_scroll_ext.dart

@@ -0,0 +1,26 @@
+import 'package:extended_nested_scroll_view/extended_nested_scroll_view.dart'
+    show ExtendedNestedScrollViewState;
+import 'package:flutter/widgets.dart' show Element, Curves;
+
+extension ExtendedNestedScrollViewStateExt on ExtendedNestedScrollViewState {
+  void refresh() {
+    if (mounted) {
+      (context as Element).markNeedsBuild();
+    }
+  }
+
+  void animToTop() {
+    if (mounted) {
+      final position = innerNestedPositions.first;
+      if (position.pixels >= position.viewportDimension * 7) {
+        position.localJumpTo(0);
+      } else {
+        outerController.animateTo(
+          outerController.offset,
+          curve: Curves.easeInOut,
+          duration: const Duration(milliseconds: 500),
+        );
+      }
+    }
+  }
+}