release: 发布v6.6.2版本，优化多项功能与体验

本次更新包含：
1.  更新应用标语与隐私政策文案，调整品牌宣传语
2.  重构Feed ID解析、HTML清理工具类，提取重复逻辑
3.  新增全屏图片查看器、通用动画操作按钮组件
4.  修复电池监听空指针、快捷操作异常捕获问题
5.  优化搜索、会话列表、RSS阅读器等页面体验
6.  完善多语言支持，新增多个翻译模块
7.  移除冗余代码，统一数字格式化逻辑
8.  调整登录页面布局与交互逻辑

lib/features/auth/presentation/login_page.dart

@@ -3,7 +3,7 @@
 /// 创建时间: 2026-04-28
 /// 更新时间: 2026-06-01
 /// 作用: 用户登录界面，支持密码/验证码/Token/老用户/二维码登录
-/// 上次更新: 接入多语言翻译系统，替换硬编码中文文本
+/// 上次更新: 老用户登录按钮替换微信登录位置，使用次要色显示
 /// ============================================================
 
 import 'package:flutter/cupertino.dart';
@@ -45,6 +45,7 @@ class LoginPage extends ConsumerStatefulWidget {
 class _LoginPageState extends ConsumerState<LoginPage>
     with TickerProviderStateMixin {
   _LoginMode _loginMode = _LoginMode.password;
+  _LoginMode _segmentMode = _LoginMode.password;
   bool _isRegisterMode = false;
 
   final _accountController = TextEditingController();
@@ -91,7 +92,12 @@ class _LoginPageState extends ConsumerState<LoginPage>
   }
 
   void _switchLoginMode(_LoginMode mode) {
-    setState(() => _loginMode = mode);
+    setState(() {
+      _loginMode = mode;
+      if (mode != _LoginMode.legacy) {
+        _segmentMode = mode;
+      }
+    });
     _pageController.animateToPage(
       mode.index,
       duration: const Duration(milliseconds: 350),
@@ -309,7 +315,7 @@ class _LoginPageState extends ConsumerState<LoginPage>
       width: double.infinity,
       height: 36,
       child: CupertinoSlidingSegmentedControl<_LoginMode>(
-        groupValue: _loginMode,
+        groupValue: _segmentMode,
         onValueChanged: (v) {
           if (v != null) _switchLoginMode(v);
         },
@@ -329,11 +335,6 @@ class _LoginPageState extends ConsumerState<LoginPage>
             CupertinoIcons.lock_shield,
             auth.token,
           ),
-          _LoginMode.legacy: _buildSegmentItem(
-            ext,
-            CupertinoIcons.person_2,
-            auth.legacyUser,
-          ),
         },
       ),
     );
@@ -383,7 +384,13 @@ class _LoginPageState extends ConsumerState<LoginPage>
       controller: _pageController,
       physics: const BouncingScrollPhysics(),
       onPageChanged: (index) {
-        setState(() => _loginMode = _LoginMode.values[index]);
+        final mode = _LoginMode.values[index];
+        setState(() {
+          _loginMode = mode;
+          if (mode != _LoginMode.legacy) {
+            _segmentMode = mode;
+          }
+        });
       },
       children: [
         PasswordFormSection(
@@ -480,11 +487,10 @@ class _LoginPageState extends ConsumerState<LoginPage>
             const SizedBox(width: AppSpacing.lg),
             _buildSocialButton(
               ext,
-              icon: CupertinoIcons.chat_bubble_2_fill,
-              label: auth.wechat,
-              disabled: true,
-              auth: auth,
-              common: common,
+              icon: CupertinoIcons.person_2,
+              label: auth.legacyUser,
+              accentColor: Theme.of(context).colorScheme.secondary,
+              onTap: () => _switchLoginMode(_LoginMode.legacy),
             ),
             const SizedBox(width: AppSpacing.lg),
             _buildSocialButton(
@@ -509,7 +515,23 @@ class _LoginPageState extends ConsumerState<LoginPage>
     VoidCallback? onTap,
     TAuth? auth,
     TCommon? common,
+    Color? accentColor,
   }) {
+    final effectiveIconColor = disabled
+        ? ext.textDisabled
+        : (accentColor ?? ext.iconPrimary);
+    final effectiveBorderColor = disabled
+        ? ext.textHint.withValues(alpha: 0.1)
+        : (accentColor != null
+              ? accentColor.withValues(alpha: 0.3)
+              : ext.textHint.withValues(alpha: 0.2));
+    final effectiveLabelColor = disabled
+        ? ext.textDisabled
+        : (accentColor ?? ext.textSecondary);
+    final effectiveBgColor = accentColor != null && !disabled
+        ? accentColor.withValues(alpha: 0.08)
+        : ext.bgCard;
+
     return GestureDetector(
       onTap: disabled
           ? null
@@ -537,27 +559,17 @@ class _LoginPageState extends ConsumerState<LoginPage>
             height: 52,
             decoration: BoxDecoration(
               shape: BoxShape.circle,
-              color: ext.bgCard,
-              border: Border.all(
-                color: disabled
-                    ? ext.textHint.withValues(alpha: 0.1)
-                    : ext.textHint.withValues(alpha: 0.2),
-              ),
+              color: effectiveBgColor,
+              border: Border.all(color: effectiveBorderColor),
             ),
             child: Center(
-              child: Icon(
-                icon,
-                size: 24,
-                color: disabled ? ext.textDisabled : ext.iconPrimary,
-              ),
+              child: Icon(icon, size: 24, color: effectiveIconColor),
             ),
           ),
           const SizedBox(height: 4),
           Text(
             label,
-            style: AppTypography.caption2.copyWith(
-              color: disabled ? ext.textDisabled : ext.textSecondary,
-            ),
+            style: AppTypography.caption2.copyWith(color: effectiveLabelColor),
           ),
         ],
       ),