fix: 首页精简——删独立今日知识卡，合并进'继续探索/今日推荐'二合一卡位（无阅读记录时显示每日推荐，有则显示继续上次），消除视觉不一致

client/src/pages/index/index.vue

@@ -30,14 +30,14 @@
       </view>
     </view>
 
-    <!-- 继续探索 -->
+    <!-- 继续探索 / 今日推荐（二合一：有上次阅读显示继续，没有则推荐今日一条） -->
-    <view class="resume-card" v-if="lastRead" @tap="resumeRead">
+    <view class="resume-card" v-if="lastRead || todayKnowledge" @tap="resumeRead">
       <view class="resume-icon">
-        <AppIcon name="clock" :size="18" />
+        <AppIcon :name="lastRead ? 'clock' : 'book'" :size="18" />
       </view>
       <view class="resume-info">
-        <text class="resume-label">继续探索</text>
+        <text class="resume-label">{{ lastRead ? '继续探索' : '今日推荐' }}</text>
-        <text class="resume-title">{{ lastRead.title }}</text>
+        <text class="resume-title">{{ (lastRead || todayKnowledge)?.title }}</text>
       </view>
       <AppIcon name="arrow-gray" :size="14" />
     </view>
@@ -81,21 +81,6 @@
         </view>
       </view>
     </view>
-
-    <!-- 今日知识卡：每天一条，读了答对就点亮 -->
-    <view class="kcard" v-if="todayKnowledge" @tap="goTodayKnowledge">
-      <view class="kcard-head">
-        <AppIcon name="book" :size="14" />
-        <text class="kcard-label">今日知识卡</text>
-        <text class="kcard-dim">{{ todayDimName }}</text>
-      </view>
-      <text class="kcard-title">{{ todayKnowledge.title }}</text>
-      <text class="kcard-desc">{{ todayKnowledge.content }}</text>
-      <view class="kcard-foot">
-        <text class="kcard-cta">去读一读 · 答对点亮 →</text>
-      </view>
-    </view>
-
     <!-- 今日快讯 -->
     <view class="section-header">
       <text class="section-title">今日快讯</text>
@@ -508,40 +493,4 @@ onShareTimeline(() => ({
 </style>
 
 <style scoped>
-.kcard {
-  background: linear-gradient(135deg, rgba(91, 95, 248, 0.08), rgba(139, 92, 246, 0.05));
-  border: 1px solid var(--glass-hover-border);
-  border-radius: var(--radius-lg);
-  padding: 14px 16px;
-  margin-bottom: 12px;
-}
-.kcard-head { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
-.kcard-label { font-size: 12px; font-weight: 700; color: var(--color-brand); }
-.kcard-dim {
-  margin-left: auto;
-  font-size: 10px;
-  color: var(--text-tertiary);
-  background: var(--glass-bg);
-  border-radius: 999px;
-  padding: 2px 8px;
-}
-.kcard-title {
-  display: block;
-  font-size: 15px;
-  font-weight: 700;
-  color: var(--text-primary);
-  line-height: 1.5;
-  margin-bottom: 6px;
-}
-.kcard-desc {
-  display: -webkit-box;
-  -webkit-box-orient: vertical;
-  -webkit-line-clamp: 2;
-  overflow: hidden;
-  font-size: 12px;
-  color: var(--text-tertiary);
-  line-height: 1.6;
-}
-.kcard-foot { margin-top: 8px; }
-.kcard-cta { font-size: 11px; font-weight: 600; color: var(--color-brand); }
 </style>