Add bidirectional refresh physics

test/widgets/bidirectional_refresh_test.dart

@@ -0,0 +1,90 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/widgets/common/bidirectional_refresh.dart';
+
+void main() {
+  Future<BuildContext> pumpRefreshHarness(
+    WidgetTester tester, {
+    required Future<void> Function() onRefresh,
+  }) {
+    late BuildContext childContext;
+
+    return tester
+        .pumpWidget(
+          MaterialApp(
+            home: Scaffold(
+              body: BidirectionalRefresh(
+                onRefresh: onRefresh,
+                child: Builder(
+                  builder: (context) {
+                    childContext = context;
+                    return const SizedBox.expand();
+                  },
+                ),
+              ),
+            ),
+          ),
+        )
+        .then((_) => childContext);
+  }
+
+  OverscrollNotification topOverscroll(BuildContext context) {
+    return OverscrollNotification(
+      metrics: FixedScrollMetrics(
+        minScrollExtent: 0,
+        maxScrollExtent: 500,
+        pixels: 0,
+        viewportDimension: 300,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1,
+      ),
+      context: context,
+      overscroll: -120,
+    );
+  }
+
+  OverscrollNotification bottomOverscroll(BuildContext context) {
+    return OverscrollNotification(
+      metrics: FixedScrollMetrics(
+        minScrollExtent: 0,
+        maxScrollExtent: 500,
+        pixels: 500,
+        viewportDimension: 300,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1,
+      ),
+      context: context,
+      overscroll: 120,
+    );
+  }
+
+  testWidgets('refresh triggers from top overscroll', (tester) async {
+    var refreshCount = 0;
+    final childContext = await pumpRefreshHarness(
+      tester,
+      onRefresh: () async {
+        refreshCount++;
+      },
+    );
+
+    topOverscroll(childContext).dispatch(childContext);
+    await tester.pump();
+
+    expect(refreshCount, 1);
+  });
+
+  testWidgets('refresh triggers from bottom overscroll', (tester) async {
+    var refreshCount = 0;
+    final childContext = await pumpRefreshHarness(
+      tester,
+      onRefresh: () async {
+        refreshCount++;
+      },
+    );
+
+    bottomOverscroll(childContext).dispatch(childContext);
+    await tester.pump();
+
+    expect(refreshCount, 1);
+  });
+}

test/widgets/contact_tile_test.dart

@@ -95,4 +95,13 @@ void main() {
     expect(find.text('Rescue One'), findsOneWidget);
     expect(find.text('John Smith'), findsNothing);
   });
+
+  testWidgets('hides public key in contact tile', (tester) async {
+    final contact = buildContact(name: 'John Smith', type: ContactType.chat);
+
+    await pumpTile(tester, contact);
+
+    expect(find.text(contact.publicKeyShort), findsNothing);
+    expect(find.byIcon(Icons.key_outlined), findsNothing);
+  });
 }