style(mobile): 优化候选人和成长页视觉细节

统一候选人、主管、案例、学习和我的成长页面中的状态色、徽标与摘要卡样式，不改变原有数据流和交互逻辑。

mobile-uni/src/pages/user/learning/index.vue

@@ -26,15 +26,15 @@
     </view>
 
     <view v-if="loggedIn" class="learning-summary">
-      <view class="summary-item">
+      <view class="summary-item pending">
         <text class="summary-value">{{ pendingCount }}</text>
         <text class="summary-label">待完成</text>
       </view>
-      <view class="summary-item">
+      <view class="summary-item completed">
         <text class="summary-value">{{ completedCount }}</text>
         <text class="summary-label">今日完成</text>
       </view>
-      <view class="summary-item">
+      <view class="summary-item reference">
         <text class="summary-value">{{ referenceCount }}</text>
         <text class="summary-label">知识引用</text>
       </view>
@@ -352,6 +352,30 @@ onShow(() => {
   background: #eff6ff;
 }
 
+.summary-item.pending {
+  background: #fff0f1;
+  border-color: #fee2e2;
+}
+.summary-item.pending .summary-value {
+  color: #bd0010;
+}
+
+.summary-item.completed {
+  background: #edf7f0;
+  border-color: #dcfce7;
+}
+.summary-item.completed .summary-value {
+  color: #168243;
+}
+
+.summary-item.reference {
+  background: #eff6ff;
+  border-color: #dbeafe;
+}
+.summary-item.reference .summary-value {
+  color: #1d4ed8;
+}
+
 .summary-value {
   display: block;
   color: #1d4ed8;