feat: 空状态插画 (CSS 简笔平板支撑小人 + 主题色气泡)

pages/leaderboard/leaderboard.wxml

@@ -15,11 +15,16 @@
     <ui-skeleton variant="list-row" count="{{5}}" />
   </view>
 
-  <!-- Empty -->
-  <view class="status-wrap" wx:elif="{{empty}}">
-    <image class="empty-icon" src="{{icons.peopleFill}}" mode="aspectFit"></image>
+  <!-- Empty with CSS illustration -->
+  <view class="empty-state" wx:elif="{{empty}}">
+    <view class="empty-illus">
+      <view class="empty-illus-body"></view>
+      <view class="empty-illus-arm empty-illus-arm--l"></view>
+      <view class="empty-illus-arm empty-illus-arm--r"></view>
+      <view class="empty-illus-bubble">加油</view>
+    </view>
     <text class="empty-text">暂无排行数据</text>
-    <text class="empty-sub">快去训练吧!</text>
+    <text class="empty-sub">快去训练吧,争当第一名!</text>
   </view>
 
   <!-- Rank list -->

pages/leaderboard/leaderboard.wxss

@@ -184,3 +184,72 @@
   from { opacity: 0; transform: translateX(-20rpx); }
   to   { opacity: 1; transform: translateX(0); }
 }
+
+/* ---- empty state illustration ---- */
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 80rpx 32rpx;
+}
+
+.empty-illus {
+  position: relative;
+  width: 200rpx;
+  height: 200rpx;
+  margin-bottom: 40rpx;
+}
+
+.empty-illus-body {
+  position: absolute;
+  bottom: 30rpx;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 160rpx;
+  height: 30rpx;
+  background: linear-gradient(90deg, var(--primary), var(--primary-light));
+  border-radius: 16rpx;
+}
+
+.empty-illus-arm {
+  position: absolute;
+  bottom: 36rpx;
+  width: 20rpx;
+  height: 60rpx;
+  background: var(--primary);
+  border-radius: 10rpx;
+}
+
+.empty-illus-arm--l {
+  left: 30rpx;
+  transform: rotate(30deg);
+}
+
+.empty-illus-arm--r {
+  right: 30rpx;
+  transform: rotate(-30deg);
+}
+
+.empty-illus-bubble {
+  position: absolute;
+  top: 0;
+  right: 0;
+  background: var(--primary-bg);
+  color: var(--primary);
+  font-size: 22rpx;
+  font-weight: 600;
+  padding: 8rpx 16rpx;
+  border-radius: 16rpx;
+  line-height: 1;
+}
+
+.empty-text {
+  font-size: 30rpx;
+  color: var(--text);
+  margin-bottom: 12rpx;
+}
+
+.empty-sub {
+  font-size: 26rpx;
+  color: var(--text-secondary);
+}