Add immediate startup login and loading states for mini program home

pets-fe/components/startup-state/index.wxml

@@ -0,0 +1,16 @@
+<view class="startup {{error?'failed':''}}">
+  <view class="glow"></view>
+  <view class="brand-wrap"><image class="brand" src="/assets/logo-corgi-v2.png" mode="aspectFit" /></view>
+  <view class="brand-name">肉垫计划</view>
+  <view class="brand-tagline">给陪伴一个温暖的地方</view>
+  <view wx:if="{{error}}" class="connection-error">
+    <view class="message">暂时没能连接</view>
+    <view class="error-copy">{{error}}</view>
+    <button class="retry" bindtap="retry">重新连接</button>
+  </view>
+  <view wx:else class="preparing" role="status">
+    <view class="dots"><view></view><view></view><view></view></view>
+    <view class="message">正在准备今天的小日常</view>
+  </view>
+  <view class="footer">陪伴它们的每一天，都值得记录</view>
+</view>