fix(frontend): restore reference VIP watermark and action-row geometry

会员条右下角那枚淡淡的 gem 水印一直没渲染出来：.payvip-icon:before 留着参考主题的 FA4 码位 f219，但本站字体栈是 FA5，该码位在 FA5 里映射不到任何字形。改为 f3a5（fa-gem，Solid 字重），这正是参考主题水印的实际内容。

操作行（用户中心 / 我的订单 / 支付中心 / 后台管理）的几何被 header-userbox.css 里的自有规则盖住了，而 main.css 里本就有参考主题的对应规则：瓦片被强制成 flex 1 1 0 加 min-width 0，容器加 4px  gap，标签还被截断。删掉这些覆盖，只保留 max-height none 这一处对全局导航链接 50px 高度上限的豁免，让 .header-user-href > a（inline-block、padding-top 10px、min-width 58px）和 .header-user-href .toggle-radius（36px）重新接管。

同时删掉 360px 断点下把图标瓦片缩到 34px 的规则，参考主题没有对应物；移动端宽度对齐参考主题的 auto。

排查中确认 main.css 整体是对参考主题的忠实移植：93 条布局工具类、8 条 padding 工具类、.sub-user-box / .header-user-href / .msg-news-icon / .payvip-icon 规则以及颜色变量均逐条一致，因此上述两处就是仅有的缺口。另外核对 f3a5 在随包 FA5 Solid 字体中可解析，fa-solid-900.woff2 确实存在。

重建 main.min.css 与 public bundle，仅这三个构建产物发生变化，JS bundle 字节级一致。573 项契约测试全部通过。

assets/css/main.min.css

@@ -1 +1 @@
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