fix(h5): 首屏清 title + 桃色顶区对齐小程序 nav-bar（nh=1）

index.html 在 Vue 前清 document.title 并预应用 mp-native-header；
CSS 桃色顶区、隐藏 AppHeader，减轻黑字与渐变冲顶。

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

apps/user-h5/index.html

@@ -4,6 +4,33 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no,viewport-fit=cover" />
     <title>愈心谷</title>
+    <script>
+      ;(function () {
+        var q = location.search.slice(1).split('&')
+        var p = {}
+        for (var i = 0; i < q.length; i++) {
+          var kv = q[i].split('=')
+          if (kv[0]) p[kv[0]] = kv[1] || ''
+        }
+        if (p.mp === '1') {
+          document.documentElement.classList.add('mp-embed')
+          document.title = '\u200b'
+          try { sessionStorage.setItem('yxg_mp_embed', '1') } catch (e) {}
+        }
+        if (p.nh === '1') {
+          document.documentElement.classList.add('mp-native-header')
+          document.title = '\u200b'
+          try { sessionStorage.setItem('yxg_mp_native_header', '1') } catch (e) {}
+          var top = 4
+          if (p.sbh && /^\d+$/.test(p.sbh)) {
+            top = parseInt(p.sbh, 10)
+            try { sessionStorage.setItem('yxg_sbh', p.sbh) } catch (e) {}
+          }
+          document.documentElement.style.setProperty('--yxg-safe-top', '0px')
+          document.documentElement.style.setProperty('--yxg-page-top', top + 'px')
+        }
+      })()
+    </script>
     <link rel="icon" type="image/png" href="/logo.png" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />