fix: refine mini program nickname collection flow

miniprogram/pages/web-view/index.wxml

@@ -10,7 +10,7 @@
 
 <view wx:elif="{{nicknameRequired}}" class="setup-screen">
   <view class="setup-card">
-    <view class="setup-title">登录</view>
+    <view class="setup-title">完善昵称</view>
     <view wx:if="{{errorMessage}}" class="setup-text setup-text--danger">
       {{errorMessage}}
     </view>
@@ -29,7 +29,7 @@
       disabled="{{loggingIn}}"
       bindtap="handleStartLogin"
     >
-      {{loggingIn ? '正在登录' : '微信快捷登录'}}
+      {{loggingIn ? '正在提交' : '确认昵称'}}
     </button>
   </view>
 </view>