refactor: ui/ux refinements

lib/shared/widgets/sheet_handle.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/widgets.dart';
+import '../theme/theme_extensions.dart';
+
+class SheetHandle extends StatelessWidget {
+  final EdgeInsetsGeometry? margin;
+  const SheetHandle({super.key, this.margin});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Container(
+        margin: margin ?? const EdgeInsets.only(top: Spacing.sm, bottom: Spacing.md),
+        width: 40,
+        height: 4,
+        decoration: BoxDecoration(
+          color: context.conduitTheme.textPrimary.withValues(alpha: Alpha.medium),
+          borderRadius: BorderRadius.circular(AppBorderRadius.xs),
+        ),
+      ),
+    );
+  }
+}
+