feat: 新增 ui-skeleton 骨架屏组件 (card / list-row / circle)

components/ui-skeleton/ui-skeleton.js

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+Component({
+  properties: {
+    variant: { type: String, value: 'card' },
+    count: { type: Number, value: 1 },
+    active: { type: Boolean, value: true }
+  },
+  data: {
+    _minDisplayShown: false
+  },
+  lifetimes: {
+    attached() {
+      // 200ms 最小显示,避免骨架闪一下
+      this._minTimer = setTimeout(() => {
+        this.setData({ _minDisplayShown: true })
+      }, 200)
+    },
+    detached() {
+      if (this._minTimer) clearTimeout(this._minTimer)
+    }
+  }
+})

components/ui-skeleton/ui-skeleton.json

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+{
+  "component": true,
+  "usingComponents": {}
+}

components/ui-skeleton/ui-skeleton.wxml

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+<view class="skeleton {{active ? 'skeleton--active' : ''}}" wx:if="{{_minDisplayShown || !active}}">
+  <!-- card variant -->
+  <block wx:if="{{variant === 'card'}}">
+    <view class="sk-card">
+      <view class="sk-bar sk-bar--title"></view>
+      <view class="sk-bar sk-bar--body"></view>
+      <view class="sk-bar sk-bar--small"></view>
+    </view>
+  </block>
+
+  <!-- list-row variant -->
+  <block wx:elif="{{variant === 'list-row'}}">
+    <view class="sk-list" wx:for="{{count}}" wx:key="*this">
+      <view class="sk-circle"></view>
+      <view class="sk-list-text">
+        <view class="sk-bar sk-bar--title"></view>
+        <view class="sk-bar sk-bar--small"></view>
+      </view>
+    </view>
+  </block>
+
+  <!-- circle variant (timer) -->
+  <block wx:elif="{{variant === 'circle'}}">
+    <view class="sk-circle sk-circle--big">
+      <view class="sk-bar sk-bar--center"></view>
+    </view>
+  </block>
+</view>

components/ui-skeleton/ui-skeleton.wxss

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+.skeleton {
+  width: 100%;
+}
+
+.skeleton--active .sk-bar,
+.skeleton--active .sk-circle {
+  animation: skShimmer 1.4s ease-in-out infinite;
+  background: linear-gradient(90deg,
+    rgba(0, 0, 0, 0.06) 0%,
+    rgba(0, 0, 0, 0.12) 50%,
+    rgba(0, 0, 0, 0.06) 100%);
+  background-size: 200% 100%;
+}
+
+@keyframes skShimmer {
+  0%   { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
+.sk-bar {
+  height: 24rpx;
+  border-radius: 8rpx;
+  margin-bottom: 16rpx;
+  background-color: rgba(0, 0, 0, 0.08);
+}
+
+.sk-bar--title { width: 60%; height: 32rpx; }
+.sk-bar--body  { width: 100%; }
+.sk-bar--small { width: 40%; height: 20rpx; margin-bottom: 0; }
+.sk-bar--center { width: 60%; height: 40rpx; }
+
+.sk-card {
+  background: var(--card-bg, #FFFFFF);
+  border-radius: 24rpx;
+  padding: 32rpx;
+  box-shadow: 0 2rpx 16rpx rgba(0, 0, 0, 0.06);
+}
+
+.sk-circle {
+  width: 64rpx;
+  height: 64rpx;
+  border-radius: 50%;
+  background-color: rgba(0, 0, 0, 0.08);
+  flex-shrink: 0;
+}
+
+.sk-circle--big {
+  width: 360rpx;
+  height: 360rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  margin: 0 auto;
+}
+
+.sk-list {
+  display: flex;
+  align-items: center;
+  padding: 24rpx 0;
+  gap: 24rpx;
+}
+
+.sk-list-text {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 8rpx;
+}
+
+/* dark mode */
+@media (prefers-color-scheme: dark) {
+  .sk-card { background: var(--card-bg, #1C1C1E); }
+  .skeleton--active .sk-bar,
+  .skeleton--active .sk-circle {
+    background: linear-gradient(90deg,
+      rgba(255, 255, 255, 0.05) 0%,
+      rgba(255, 255, 255, 0.10) 50%,
+      rgba(255, 255, 255, 0.05) 100%);
+    background-size: 200% 100%;
+  }
+  .sk-bar,
+  .sk-circle {
+    background-color: rgba(255, 255, 255, 0.06);
+  }
+}