fix(h5): 修复 WebView 顶栏 logo 与内容重叠

embed 模式 header 改文档流、移除负 margin；持久化 sbh 并在路由中保留，避免胶囊区与档案条重叠。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/user-h5/src/lib/mpEmbed.spec.ts

@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it } from 'vitest'
-import { initMpEmbed, isMpEmbed } from './mpEmbed'
+import { applyMpEmbedDom, initMpEmbed, isMpEmbed } from './mpEmbed'
 
 describe('mpEmbed', () => {
   beforeEach(() => {
@@ -17,11 +17,15 @@ describe('mpEmbed', () => {
     expect(isMpEmbed()).toBe(true)
   })
 
-  it('applies status bar height from ?sbh=', () => {
+  it('persists status bar height from ?sbh=', () => {
     window.history.replaceState({}, '', '/psy/?mp=1&sbh=47')
     initMpEmbed()
     expect(document.documentElement.style.getPropertyValue('--yxg-safe-top')).toBe('47px')
     expect(document.documentElement.style.getPropertyValue('--yxg-page-top')).toBe('calc(47px + 50px)')
+    expect(sessionStorage.getItem('yxg_sbh')).toBe('47')
+    window.history.replaceState({}, '', '/psy/?mp=1')
+    applyMpEmbedDom()
+    expect(document.documentElement.style.getPropertyValue('--yxg-safe-top')).toBe('47px')
   })
 
   it('returns false without mp query', () => {