Fix onboarding layout issues

test/widgets/add_channel_dialog_test.dart

@@ -0,0 +1,64 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/widgets/contacts/add_channel_dialog.dart';
+
+void main() {
+  Future<void> pumpDialog(
+    WidgetTester tester, {
+    required Future<void> Function(String name, String secret) onCreateChannel,
+  }) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: Scaffold(
+          body: Builder(
+            builder: (context) => Center(
+              child: AddChannelDialog(onCreateChannel: onCreateChannel),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  testWidgets('submits hash channels with an empty secret', (tester) async {
+    String? submittedName;
+    String? submittedSecret;
+
+    await pumpDialog(
+      tester,
+      onCreateChannel: (name, secret) async {
+        submittedName = name;
+        submittedSecret = secret;
+      },
+    );
+
+    await tester.enterText(find.byType(TextFormField).first, '#slovenia');
+    await tester.pump();
+    await tester.tap(find.text('Create Channel'));
+    await tester.pumpAndSettle();
+
+    expect(submittedName, '#slovenia');
+    expect(submittedSecret, '');
+  });
+
+  testWidgets('uses done action for hash channels', (tester) async {
+    String? submittedName;
+
+    await pumpDialog(
+      tester,
+      onCreateChannel: (name, secret) async {
+        submittedName = name;
+      },
+    );
+
+    await tester.enterText(find.byType(TextFormField).first, '#slovenia');
+    await tester.pump();
+    await tester.testTextInput.receiveAction(TextInputAction.done);
+    await tester.pumpAndSettle();
+
+    expect(submittedName, '#slovenia');
+  });
+}