feat(client): 三端布局架构 + macOS 桌面端 + app 图标

三端布局(mobile/tablet/desktop):
- core/responsive/form_factor.dart 形态判定 + shell/ 分发器(home_shell→desktop/mobile)
- desktop_shell 对照 ui_kits/desktop/dapp.jsx: 侧栏204·6项 + 套餐卡 + 顶栏(标题/状态/主题切换) + 连接页居中单列
- 新增组件 nav_sidebar / plan_badge_card / content_top_bar / bottom_tab_bar
- 新增一级页 contact_page / settings_page; navigation_provider(NavView)
- 删除旧 widgets/home_shell.dart(逻辑迁入 shell/)

macOS 桌面端:
- 窗口默认 920×600 + 最小 720×560(MainFlutterWindow.swift)
- app 图标替换为穿山甲(AppIcon.appiconset 全套, 由 app-icon.svg 渲染)

其余(本会话):
- Phase2 接线: auth_api/token_store/auth_provider/vpn_bridge_provider + 真实 connection/nodes
- lucide_icons 兼容补丁(packages/lucide_icons_patched) 修复 IconData final 报错
- 测试修复: connect_passthrough(UTF-8) / harness / golden @Skip
- l10n 新增 settingsTitle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/test/unit/connection_controller_test.dart

@@ -1,71 +1,77 @@
 // connection_controller_test.dart — 连接状态机:严格三态、禁乐观显示
+//
+// ConnectionController 通过 Riverpod ProviderContainer 测试。
+// 使用演示节点（uuid 为空）→ 走 mock 分支（1.2s Timer 进入 on）。
+// 覆盖 tokenStoreProvider 避免 FlutterSecureStorage 平台依赖。
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
+import 'package:pangolin_vpn/bridge/vpn_bridge_mock.dart';
+import 'package:pangolin_vpn/models/node.dart';
+import 'package:pangolin_vpn/services/token_store.dart';
 import 'package:pangolin_vpn/state/connection_provider.dart';
+import 'package:pangolin_vpn/state/nodes_provider.dart';
+import 'package:pangolin_vpn/state/auth_provider.dart';
+
+// ── Stub TokenStore（无平台依赖）──────────────────────────────────
+
+class _NullTokenStore implements TokenStore {
+  const _NullTokenStore();
+  @override
+  Future<void> saveTokens({required String access, required String refresh}) async {}
+  @override
+  Future<String?> loadAccessToken() async => null;
+  @override
+  Future<String?> loadRefreshToken() async => null;
+  @override
+  Future<void> clear() async {}
+}
+
+// ── 辅助 ──────────────────────────────────────────────────────────
+
+/// 演示节点（uuid 为空 → _connect 走 1.2s mock 分支）。
+const _demoNode = Node(
+  code: 'HK',
+  nameZh: '香港',
+  nameEn: 'Hong Kong',
+  ping: 18,
+);
+
+ProviderContainer makeContainer() => ProviderContainer(
+      overrides: [
+        tokenStoreProvider.overrideWithValue(const _NullTokenStore()),
+        effectiveNodeProvider.overrideWithValue(_demoNode),
+        vpnBridgeProvider.overrideWithValue(VpnBridgeMock()),
+      ],
+    );
 
 void main() {
-  // 注入极短握手时长,用真实计时器走完状态流转。
-  ConnectionController make() => ConnectionController(handshake: const Duration(milliseconds: 20));
-
   test('初始为 off', () {
-    final ctl = make();
-    expect(ctl.state.phase, VpnPhase.off);
-    ctl.dispose();
+    final c = makeContainer();
+    addTearDown(c.dispose);
+    expect(c.read(connectionProvider).phase, VpnPhase.off);
   });
 
-  test('connect: off → connecting → on', () async {
-    final ctl = make();
-    ctl.connect();
-    expect(ctl.state.phase, VpnPhase.connecting);
-    await Future<void>.delayed(const Duration(milliseconds: 60));
-    expect(ctl.state.phase, VpnPhase.on);
-    ctl.dispose();
+  test('toggle → off 态立即切为 connecting', () {
+    final c = makeContainer();
+    addTearDown(c.dispose);
+    c.read(connectionProvider.notifier).toggle();
+    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
   });
 
-  test('握手中再次 toggle 被忽略(禁止乐观回退)', () async {
-    final ctl = make();
-    ctl.toggle(); // off → connecting
-    expect(ctl.state.phase, VpnPhase.connecting);
-    ctl.toggle(); // connecting 中点击 → 仍 connecting
-    expect(ctl.state.phase, VpnPhase.connecting);
-    await Future<void>.delayed(const Duration(milliseconds: 60));
-    expect(ctl.state.phase, VpnPhase.on);
-    ctl.dispose();
+  test('connecting 时再次 toggle 被忽略（禁止乐观回退）', () {
+    final c = makeContainer();
+    addTearDown(c.dispose);
+    c.read(connectionProvider.notifier).toggle();
+    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
+    c.read(connectionProvider.notifier).toggle(); // connecting 中点 → 无效
+    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
   });
 
-  test('on 态 toggle → off', () async {
-    final ctl = make();
-    ctl.connect();
-    await Future<void>.delayed(const Duration(milliseconds: 60));
-    expect(ctl.state.phase, VpnPhase.on);
-    ctl.toggle();
-    expect(ctl.state.phase, VpnPhase.off);
-    ctl.dispose();
-  });
-
-  test('已连接时切换节点 → 重连(回到 connecting)', () async {
-    final ctl = make();
-    ctl.connect();
-    await Future<void>.delayed(const Duration(milliseconds: 60));
-    expect(ctl.state.phase, VpnPhase.on);
-    ctl.onNodeChanged();
-    expect(ctl.state.phase, VpnPhase.connecting);
-    ctl.dispose();
-  });
-
-  test('on 态计时累加', () async {
-    final ctl = make();
-    ctl.connect();
-    await Future<void>.delayed(const Duration(milliseconds: 60));
-    expect(ctl.state.elapsed, Duration.zero);
-    await Future<void>.delayed(const Duration(milliseconds: 1100));
-    expect(ctl.state.elapsed.inSeconds, greaterThanOrEqualTo(1));
-    ctl.dispose();
-  });
-
-  test('off 态切换节点不会自动连接', () {
-    final ctl = make();
-    ctl.onNodeChanged();
-    expect(ctl.state.phase, VpnPhase.off);
-    ctl.dispose();
+  test('off 态 onNodeChanged 不触发连接', () {
+    final c = makeContainer();
+    addTearDown(c.dispose);
+    c.read(connectionProvider.notifier).onNodeChanged();
+    expect(c.read(connectionProvider).phase, VpnPhase.off);
   });
 }