feat: 预加载优化、nav-bar 箭头居中优化

miniprogram/components3.0/nav-bar/nav-bar.less

@@ -63,6 +63,7 @@
     font-size: 40rpx;
     color: @color-nav-title;
     line-height: 1;
+    margin-top: 4rpx;
 }
 
 .nav-bar__title {
@@ -85,4 +86,4 @@
 .nav-bar__placeholder {
     width: 100%;
     flex-shrink: 0;
-}
+}

miniprogram/components3.0/worksheet-card/worksheet-card.ts

@@ -54,7 +54,8 @@ Component({
     },
     methods: {
         onTap() {
-            this.triggerEvent('tap', {
+            // 使用 cardtap 避免与原生 tap 同名，防止安卓上父级 bindtap 重复触发 navigateTo
+            this.triggerEvent('cardtap', {
                 title: this.data.title,
                 path: this.data.path,
             });

miniprogram/components3.0/worksheet-card/worksheet-card.wxml

@@ -2,7 +2,7 @@
     class="worksheet-card worksheet-card--{{variant}}"
     hover-class="worksheet-card--active"
     hover-stay-time="100"
-    bindtap="onTap">
+    catchtap="onTap">
     <block wx:if="{{variant === 'track'}}">
         <view class="worksheet-card__top">
             <image