feat(fe): 肉垫 FAB + 冷启动闪屏；顶部筛选改纯文字对齐

- FAB 重设计成肉垫造型（呼应「肉垫计划」），修 fab.js 漏声明
  icon 属性导致的兜底文档图标；社区发帖 FAB 保持图标
- onboarding 加冷启动闪屏，登录+拉宠物在闪屏期完成再进首页，
  不再闪一下建档向导；欢迎屏 logo 换肉垫、去掉过时 AI 文案
- 顶部宠物筛选去掉头像改纯文字（带图/emoji 时高度对不齐），
  固定高度 + vertical-align:middle 彻底对齐，添加用「＋」文字

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

pets-fe/pages/onboarding/onboarding.wxml

@@ -1,3 +1,17 @@
+<!-- 冷启动闪屏：登录 + 拉宠物期间显示，不再闪一下建档向导 -->
+<view wx:if="{{booting}}" class="boot">
+  <view class="boot-badge">
+    <view class="paw">
+      <view class="bean bean-1"></view><view class="bean bean-2"></view>
+      <view class="bean bean-3"></view><view class="bean bean-4"></view>
+      <view class="pad"></view>
+    </view>
+  </view>
+  <view class="boot-name">肉垫计划</view>
+  <view class="boot-tip">正在准备今天的养护计划…</view>
+</view>
+
+<block wx:else>
 <nav-bar title="肉垫计划"></nav-bar>
 
 <scroll-view class="page-scroll" scroll-y="{{true}}" enhanced="{{true}}" show-scrollbar="{{false}}">
@@ -5,14 +19,20 @@
   <!-- step 0 欢迎 -->
   <view wx:if="{{step === 0}}" class="step">
     <view class="hero">
-      <view class="pet-logo"><pt-icon name="community" size="{{88}}" color="#fff"></pt-icon></view>
+      <view class="pet-logo">
+        <view class="paw">
+          <view class="bean bean-1"></view><view class="bean bean-2"></view>
+          <view class="bean bean-3"></view><view class="bean bean-4"></view>
+          <view class="pad"></view>
+        </view>
+      </view>
       <view class="hero-h1">肉垫计划</view>
       <view class="hero-sub">新手养宠的养护日历、健康记录和成长报告。先生成计划，再每天照着做。</view>
     </view>
     <view class="proof-row">
       <view class="proof"><text class="proof-b">30天</text><text class="proof-s">新手计划</text></view>
-      <view class="proof"><text class="proof-b">8类</text><text class="proof-s">快速记录</text></view>
-      <view class="proof"><text class="proof-b">AI</text><text class="proof-s">观察建议</text></view>
+      <view class="proof"><text class="proof-b">24类</text><text class="proof-s">快速记录</text></view>
+      <view class="proof"><text class="proof-b">成长</text><text class="proof-s">报告卡片</text></view>
     </view>
     <button class="btn btn-primary btn-block" bindtap="nextStep">开始建档，生成计划</button>
     <view class="skip-link" bindtap="skipBrowse">先随便看看</view>
@@ -104,3 +124,4 @@
   </view>
 </view>
 </scroll-view>
+</block>