feat: Android TV support (#503)

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/widgets/shared/ensure_visible.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+extension EnsureVisibleHelper on BuildContext {
+  Future<void> ensureVisible({
+    Duration duration = const Duration(milliseconds: 300),
+    double? alignment,
+    Curve curve = Curves.fastOutSlowIn,
+  }) {
+    return Scrollable.ensureVisible(
+      this,
+      duration: duration,
+      alignment: alignment ?? 0.5,
+      curve: curve,
+    );
+  }
+}