fix(YourPuzzleComponent): 修复背景图未显示完全的问题

- 为 img 标签添加 object-fit: contain 样式，确保图片按比例显示
- 添加图片预加载功能，提高组件加载性能
- 增加图片加载失败的错误处理机制
- 优化滑块样式，设置背景图片不重复并居中显示
- 调整滑块位置，解决显示不完整的问题

app/components/YourPuzzleComponent.vue

@@ -2,13 +2,13 @@
   <div class="puzzle-container">
     <div class="puzzle-box" :style="{ height: boxHeight + 'px' }">
       <!-- 背景图 -->
-      <img :src="bgImageUrl" class="bg-image" ref="bgImage" @load="onImageLoad">
+      <img :src="bgImageUrl" class="bg-image" ref="bgImage" @load="onImageLoad" @error="handleImageError">
       <!-- 滑块 -->
       <div 
         class="slider-block"
         :style="{
           backgroundImage: `url(${sliderImageUrl})`,
-          top: `${blockY}px`,
+          top: `${blockY-2}px`,
           left: `${moveX}px`,
           visibility: loaded ? 'visible' : 'hidden'
         }"
@@ -81,7 +81,13 @@ const bgImage = ref(null)
 // 方法
 const onImageLoad = () => {
   if (bgImage.value) {
+    try {
       const img = bgImage.value
+      // 确保图片已经完全加载
+      if (!img.complete) {
+        return
+      }
+      
       const scale = img.width / img.naturalWidth // 计算图片缩放比例
       boxHeight.value = img.height
       
@@ -91,7 +97,25 @@ const onImageLoad = () => {
       
       maxMoveX.value = img.width - blockSize // 使用实际显示的滑块大小计算最大移动距离
       loaded.value = true
+    } catch (error) {
+      console.error('Image load error:', error)
+      // 设置默认值以确保组件仍然可用
+      const defaultBlockSize = 50
+      document.documentElement.style.setProperty('--block-size', defaultBlockSize + 'px')
+      maxMoveX.value = 320 - defaultBlockSize // 使用默认容器宽度
+      loaded.value = true
     }
+  }
+}
+
+// 添加图片错误处理
+const handleImageError = () => {
+  console.error('Image failed to load')
+  // 设置默认值以确保组件仍然可用
+  const defaultBlockSize = 50
+  document.documentElement.style.setProperty('--block-size', defaultBlockSize + 'px')
+  maxMoveX.value = 320 - defaultBlockSize
+  loaded.value = true
 }
 
 const handleMouseDown = (event) => {
@@ -160,8 +184,24 @@ const handleTouchEnd = () => {
   handleMouseUp()
 }
 
+// 预加载图片
+const preloadImages = () => {
+  const bgImg = new Image()
+  const sliderImg = new Image()
+  
+  bgImg.onload = () => {
+    if (bgImage.value) {
+      onImageLoad()
+    }
+  }
+  
+  bgImg.src = props.bgImageUrl
+  sliderImg.src = props.sliderImageUrl
+}
+
 // 生命周期钩子
 onMounted(() => {
+  preloadImages()
   window.addEventListener('mousemove', handleMouseMove)
   window.addEventListener('mouseup', handleMouseUp)
   window.addEventListener('touchmove', handleTouchMove)
@@ -210,6 +250,10 @@ onBeforeUnmount(() => {
   -webkit-user-select: none;
   user-select: none;
   pointer-events: none;
+  object-fit: contain;
+  max-width: 100%;
+  -webkit-touch-callout: none;
+  -webkit-tap-highlight-color: transparent;
 }
 
 .slider-block {
@@ -217,6 +261,8 @@ onBeforeUnmount(() => {
   width: var(--block-size);
   height: var(--block-size);
   background-size: 100% 100%;
+  background-repeat: no-repeat;
+  background-position: center;
   cursor: pointer;
   -webkit-user-select: none;
   user-select: none;
@@ -224,6 +270,8 @@ onBeforeUnmount(() => {
   will-change: transform;
   transform: translateZ(0);
   backface-visibility: hidden;
+  -webkit-touch-callout: none;
+  -webkit-tap-highlight-color: transparent;
 }
 
 .slider-container {