refactor: 拆分主页与公共组件，扫码登录改走 WinHTTP

- 抽出 lib/core 的日期/JSON 工具，收敛各页重复解析
- 主页与音乐风险页拆成组件，风险功能共用一套运行框架
- 修复设置页作为主页页签保存时弹掉根路由导致的黑屏
- 登录对齐 Astral aimedb 协议：84 位二维码校验、签名与请求头修正，
  补 GlobalSign 中间证书；Windows 改用 WinHTTP 绕过服务端对
  BoringSSL 的 TLS 指纹拦截（证书校验保持开启）
- 补开发预览数据与测试

lib/widgets/home/home_preview_cards.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+
+import '../../config/strings.dart';
+import '../../models/user_preview.dart';
+import 'home_common.dart';
+
+class PreviewGameInfoCard extends StatelessWidget {
+  final UserPreviewDataBean preview;
+
+  const PreviewGameInfoCard({super.key, required this.preview});
+
+  @override
+  Widget build(BuildContext context) {
+    return HomeSectionCard(
+      title: AppStrings.gameInfo,
+      rows: [
+        (AppStrings.lastGame, preview.lastGameId),
+        (AppStrings.lastPlay, preview.lastPlayDate),
+        (AppStrings.lastLogin, preview.lastLoginDate),
+        (AppStrings.romVersion, preview.lastRomVersion),
+        (AppStrings.dataVersion, preview.lastDataVersion),
+      ],
+    );
+  }
+}
+
+class PreviewStatusCard extends StatelessWidget {
+  final UserPreviewDataBean preview;
+
+  const PreviewStatusCard({super.key, required this.preview});
+
+  @override
+  Widget build(BuildContext context) {
+    return HomeStatusCard(
+      chips: [
+        HomeStatusChip(AppStrings.netMember, preview.isNetMember),
+        HomeStatusChip(AppStrings.inherit, preview.isInherit),
+        HomeStatusChip(
+          AppStrings.banState,
+          preview.banState == 0,
+          trueText: AppStrings.clean,
+          falseText: '已封禁 (${preview.banState})',
+        ),
+      ],
+    );
+  }
+}