style(game): 更新风向方块组件样式

- 替换三角形图标为正方形基础图标
- 移除四个三角形元素，改用对角线装饰设计
- 调整组件尺寸从128px改为96px，并增加圆角效果
- 更新阴影和渐变背景样式以提升视觉效果
- 优化风向标签的位置和大小布局
- 修改风向图标样式为全白色调显示
- 调整各个风向位置的坐标定位参数

src/assets/images/icons/square.svg

@@ -0,0 +1 @@
+<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg t="1774505292809" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="15817" width="256" height="256" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M1024 127.937531v767.625183c0 70.665495-57.272035 127.937531-127.937531 127.93753h-767.625183c-70.665495 0-127.937531-57.272035-127.93753-127.93753v-767.625183c0-70.665495 57.272035-127.937531 127.93753-127.937531h767.625183c70.665495 0 127.937531 57.272035 127.937531 127.937531z" p-id="15818" fill="#ffffff"></path></svg>