feat: Improve library search screen (#477)

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

lib/util/position_provider.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/widgets.dart';
+
+enum PositionContext { first, middle, last }
+
+class PositionProvider extends InheritedWidget {
+  final PositionContext position;
+
+  const PositionProvider({
+    required this.position,
+    required super.child,
+    super.key,
+  });
+
+  static PositionContext of(BuildContext context) {
+    final provider = context.dependOnInheritedWidgetOfExactType<PositionProvider>();
+    assert(provider != null, 'No PositionProvider found in context');
+    return provider?.position ?? PositionContext.middle;
+  }
+
+  @override
+  bool updateShouldNotify(PositionProvider oldWidget) => position != oldWidget.position;
+}