fix(frontend): 统一首页和成长页面今日任务标题命名

cfc-frontend/pages/growth-main/index.vue

@@ -207,7 +207,7 @@
       <view class="section" v-if="recentTasks.length > 0">
         <view class="task-preview-card">
           <view class="task-preview-header">
-            <text class="task-preview-title">📋 待办任务</text>
+            <text class="task-preview-title">📋 今日任务</text>
             <text class="task-preview-more" @click="goToTasks">更多 ›</text>
           </view>
           <view class="task-preview-list">

cfc-frontend/pages/home-pages/parent-index.vue

@@ -224,7 +224,7 @@
 
       <!-- ===== d) 今日重点 ===== -->
       <view class="today-section animate-fade-in animate-stagger-7">
-        <view class="section-title">今日重点</view>
+        <view class="section-title">📋 今日任务</view>
         <PlayfulCard variant="flat" class="today-card">
           <template slot="header">
             <view class="today-header">