feat(legal): in-app Privacy & rules screen with plain-words summaries and links to the full documents

apps/app_seeds/test/ui/legal_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/i18n/strings.g.dart';
+import 'package:tane/ui/legal_screen.dart';
+
+void main() {
+  Widget app() => TranslationProvider(
+    child: const MaterialApp(
+      localizationsDelegates: GlobalMaterialLocalizations.delegates,
+      home: LegalScreen(),
+    ),
+  );
+
+  testWidgets('shows the three summaries with their full-text links', (
+    tester,
+  ) async {
+    LocaleSettings.setLocaleSync(AppLocale.en);
+    await tester.pumpWidget(app());
+    await tester.pump();
+
+    expect(find.text('Your privacy'), findsOneWidget);
+    // No account, no tracker, plain-words copy is on screen.
+    expect(find.textContaining('without an account'), findsOneWidget);
+    expect(find.text('Read the full documents online'), findsWidgets);
+
+    // The later sections start below the fold of the test viewport.
+    await tester.scrollUntilVisible(find.text('About sharing seeds'), 300);
+    expect(find.text('Rules of the road'), findsOneWidget);
+    expect(find.text('About sharing seeds'), findsOneWidget);
+  });
+
+  testWidgets('renders under RTL without overflowing', (tester) async {
+    LocaleSettings.setLocaleSync(AppLocale.en);
+    await tester.pumpWidget(
+      TranslationProvider(
+        child: const MaterialApp(
+          localizationsDelegates: GlobalMaterialLocalizations.delegates,
+          home: Directionality(
+            textDirection: TextDirection.rtl,
+            child: LegalScreen(),
+          ),
+        ),
+      ),
+    );
+    await tester.pump();
+    expect(tester.takeException(), isNull);
+    expect(find.byType(LegalScreen), findsOneWidget);
+  });
+}