fix(navigation): stop the public reset from overriding the reference menu styles

The public bundle loads after main.min.css, and its bare-element rules
won on equal specificity:

- img { display: block; height: auto } replaced the inline image baseline
  the menu relies on (Bootstrap img{vertical-align:middle} + main.css
  img{max-height:100%}). Menu glyphs and graphic-card thumbnails were
  pulled out of the inline flow, breaking row height and baseline.
  Scoped the reset to content and restored the inline baseline inside
  .header / .mobile-header.
- html { overflow-x: clip/hidden } made the root a clipping context,
  which crops the position:fixed senior mega menu and its drop panels.
  The horizontal-overflow guard now lives on body only.

Rebuilt public.css / public.min.css.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/css/core/reset.css

@@ -15,7 +15,6 @@ html {
   -webkit-text-size-adjust: 100%;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
-  overflow-x: hidden;
   text-rendering: optimizeLegibility;
 }
 
@@ -30,7 +29,11 @@ body {
   overflow-x: hidden;
 }
 
-/* 媒体元素 */
+/* 媒体元素
+ *
+ * 导航树排除在外：main.css 的导航依赖 Bootstrap 的 inline 图片基线
+ * (img{vertical-align:middle} + max-height)，裸 img 的 display:block
+ * 会把菜单图标和图文卡片从行内排版里拽出来，撑乱菜单行的高度与基线。 */
 img,
 picture,
 video,
@@ -40,6 +43,13 @@ canvas {
   height: auto;
 }
 
+.header img,
+.mobile-header img {
+  display: inline;
+  height: auto;
+  vertical-align: middle;
+}
+
 /* 表单元素继承字体 */
 input,
 button,