feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/test/shared/theme/community_theme_preference_test.dart

@@ -0,0 +1,123 @@
+import 'dart:convert';
+
+import 'package:buzz/shared/theme/theme.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  test('desktop v1 payload round-trips exactly', () {
+    final preference = CommunityThemePreference.fromJson({
+      'version': 1,
+      'theme': 'github-dark',
+      'accent': '#c0a2f1',
+      'followSystem': false,
+    });
+
+    expect(preference.mode, ThemeMode.dark);
+    expect(
+      jsonEncode(preference.toJson()),
+      '{"version":1,"theme":"github-dark","accent":"#c0a2f1","followSystem":false}',
+    );
+  });
+
+  test('rejects unknown themes, accents, and future versions', () {
+    for (final payload in [
+      {
+        'version': 2,
+        'theme': 'buzz',
+        'accent': '#3b82f6',
+        'followSystem': true,
+      },
+      {
+        'version': 1,
+        'theme': 'unknown',
+        'accent': '#3b82f6',
+        'followSystem': true,
+      },
+      {
+        'version': 1,
+        'theme': 'buzz',
+        'accent': '#000000',
+        'followSystem': true,
+      },
+    ]) {
+      expect(
+        () => CommunityThemePreference.fromJson(payload),
+        throwsFormatException,
+      );
+    }
+  });
+
+  test('storage is scoped by pubkey and normalized relay URL', () async {
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
+    final storage = CommunityThemeStorage(prefs);
+    const a = CommunityThemePreference(
+      theme: 'buzz',
+      accent: '#3b82f6',
+      followSystem: true,
+    );
+    const b = CommunityThemePreference(
+      theme: 'dracula',
+      accent: '#ef4444',
+      followSystem: false,
+    );
+
+    await storage.write('pk', 'WSS://Relay.Example///', a);
+    await storage.write('pk', 'wss://other.example', b);
+
+    expect(storage.read('pk', 'wss://relay.example'), a);
+    expect(storage.read('pk', 'wss://other.example/'), b);
+    expect(storage.read('other-pk', 'wss://relay.example'), isNull);
+  });
+
+  test('dirty outbox survives restart and clears only exact ack', () async {
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
+    final storage = CommunityThemeStorage(prefs);
+    const pending = CommunityThemePreference(
+      theme: 'dracula',
+      accent: '#ef4444',
+      followSystem: false,
+    );
+    const newer = CommunityThemePreference(
+      theme: 'houston',
+      accent: '#a855f7',
+      followSystem: false,
+    );
+
+    await storage.writeOutbox('pk', 'wss://relay.example', pending);
+    expect(
+      CommunityThemeStorage(prefs).readOutbox('pk', 'wss://relay.example'),
+      pending,
+    );
+    await storage.writeOutbox('pk', 'wss://relay.example', newer);
+    await storage.clearOutbox('pk', 'wss://relay.example', pending);
+    expect(storage.readOutbox('pk', 'wss://relay.example'), newer);
+    await storage.clearOutbox('pk', 'wss://relay.example', newer);
+    expect(storage.readOutbox('pk', 'wss://relay.example'), isNull);
+  });
+
+  test('legacy accent indexes migrate without inventing wire values', () async {
+    SharedPreferences.setMockInitialValues({
+      'buzz_theme_mode': 'dark',
+      'buzz_color_scheme': 'dracula',
+      'buzz_accent_color': 8,
+    });
+    final prefs = await SharedPreferences.getInstance();
+    final preference = CommunityThemeStorage(prefs).legacyPreference();
+
+    expect(
+      preference,
+      const CommunityThemePreference(
+        theme: 'dracula',
+        accent: 'neutral',
+        followSystem: false,
+      ),
+    );
+    expect(preference.mode, ThemeMode.dark);
+    expect(legacyAccentWireValue(6), '#a855f7');
+    expect(legacyAccentWireValue(7), '#6366f1');
+  });
+}