feat(login): forward invite-code to login redirect (query > cookie)

docs/.vitepress/theme/utils/navigate.ts

@@ -1,6 +1,28 @@
 import { withQuery } from 'ufo'
 import { localePath } from './i18n'
 
+const INVITE_CODE_KEY = 'invite-code'
+
+function readCookie(name: string): string | undefined {
+  if (typeof document === 'undefined') return undefined
+  const target = `${name}=`
+  for (const part of document.cookie.split(';')) {
+    const trimmed = part.trim()
+    if (trimmed.startsWith(target)) {
+      return decodeURIComponent(trimmed.slice(target.length))
+    }
+  }
+  return undefined
+}
+
+/** 优先读 URL query 的 invite-code，退回 cookie（enhanceApp 里已把 URL 的 invite-code 写入 cookie）。 */
+function resolveInviteCode(): string | undefined {
+  if (typeof window === 'undefined') return undefined
+  const fromQuery = new URLSearchParams(window.location.search).get(INVITE_CODE_KEY)
+  if (fromQuery) return fromQuery
+  return readCookie(INVITE_CODE_KEY)
+}
+
 /**
  * 生成登录重定向路径
  * @param ssoParams 传递给 SSO 页面的额外查询参数
@@ -12,9 +34,12 @@ export function createLoginRedirectPath(ssoParams?: Record<string, string | numb
     ...ssoParams,
   })
 
+  const inviteCode = resolveInviteCode()
+
   return withQuery(localePath(`/login`), {
     redirect_to,
     logout: '1',
     'with-us': '1',
+    ...(inviteCode ? { [INVITE_CODE_KEY]: inviteCode } : {}),
   })
 }