Refactor user profile handling and navigation logic in the mini program. Introduce functions to ensure user profile completeness after login, update avatar selection process, and enhance navigation between chapters based on backend data. Update API endpoints for user data synchronization and improve user experience with new UI elements for profile editing.

miniprogram/pages/link-preview/link-preview.wxml

@@ -0,0 +1,28 @@
+<view class="page">
+  <!-- 简单自定义导航栏 -->
+  <view class="nav-bar" style="padding-top: {{statusBarHeight}}px;">
+    <view class="nav-content" style="height: {{navBarHeight - statusBarHeight}}px;">
+      <view class="nav-back" bindtap="goBack">
+        <text class="back-arrow">←</text>
+      </view>
+      <view class="nav-title">
+        <text class="nav-title-text">{{title}}</text>
+      </view>
+      <view class="nav-actions">
+        <view class="copy-btn" bindtap="copyLink">
+          <text class="copy-text">复制链接</text>
+        </view>
+      </view>
+    </view>
+  </view>
+  <view class="nav-placeholder" style="height: {{navBarHeight}}px;"></view>
+
+  <!-- 链接预览区域 -->
+  <view class="webview-wrap" wx:if="{{url}}">
+    <web-view src="{{url}}"></web-view>
+  </view>
+  <view class="empty-wrap" wx:else>
+    <text class="empty-text">暂无链接地址</text>
+  </view>
+</view>
+