Revert "fix: declutter today view and task rows"

This reverts commit 081cddaf54.

frontend/src/MvpPanel.vue

@@ -286,13 +286,13 @@ onBeforeUnmount(() => {
 </script>
 
 <template>
-  <section class="mvp-view" :class="{ loading: busy, 'today-habit-panel': view === 'today-habits' }">
+  <section class="mvp-view" :class="{ loading: busy }">
     <p v-if="error" class="inline-error">{{ error }}</p>
 
     <!-- 习惯（TickTick 风格：一次只操作一个习惯，不再逐格小按钮误触） -->
     <template v-if="view === 'habits' || view === 'today-habits'">
-      <header v-if="view === 'habits'" class="view-intro page-subtitle">
-        <small>把想坚持的事，变成每天的日常</small>
+      <header v-if="view === 'habits'" class="view-intro">
+        <div><small>把想坚持的事，变成每天的日常</small><h2>习惯</h2></div>
         <button class="soft-button" @click="loadHabits"><RefreshCw />刷新</button>
       </header>
 
@@ -336,8 +336,8 @@ onBeforeUnmount(() => {
 
     <!-- 设置与数据 -->
     <template v-else>
-      <header class="view-intro page-subtitle">
-        <small>备份、迁移与安全</small>
+      <header class="view-intro">
+        <div><small>备份、迁移与安全</small><h2>设置与数据</h2></div>
       </header>
       <div class="settings-grid">
         <article class="tool-card"><FileJson /><h3>数据导出与恢复</h3><p>下载完整 JSON 备份，或从备份恢复。</p><button class="soft-button" @click="exportData"><Download />导出 JSON</button><label class="file-button"><ArchiveRestore />选择备份<input type="file" accept="application/json" @change="restoreFile=($event.target as HTMLInputElement).files?.[0]||null"></label><button v-if="restoreFile" class="danger-button" @click="restore">确认恢复</button></article>