修改中心主指示器：半透明区域显示为完整目标区域范围

AutoRobot/Windows/Robot/Web/src/DockLayout/DockIndicator.vue

@@ -694,10 +694,10 @@ const previewAreaStyle = computed(() => {
     case 'center':
       return {
         position: 'absolute',
-        left: `${left + width * threshold}px`,
-        top: `${top + height * threshold}px`,
-        width: `${width * (1 - 2 * threshold)}px`,
-        height: `${height * (1 - 2 * threshold)}px`
+        left: `${left}px`,
+        top: `${top}px`,
+        width: `${width}px`,
+        height: `${height}px`
       };
     default:
       return {};