fix(xiaohongshu): adapt publish to new two-step creator center UI

[Astro-Han]

Description

Adapt xiaohongshu publish to the new creator center two-step UI where images must be uploaded before the title/content editor form appears. Previously the command failed with "Could not find title input" because the editor only renders after image upload.

Related issue: #460

Type of Change

• 🐛 Bug fix

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Screenshots / Output

Before (failing):

📭 Could not find title input. Debug screenshot: /tmp/xhs_publish_title_debug.png

After (working):

  xiaohongshu/publish
┌───────────────────────────────┬──────────────────────────────────┐
│ Status                        │ Detail                           │
├───────────────────────────────┼──────────────────────────────────┤
│ ⚠️ 操作完成，请在浏览器中确认 │ "测试标题" · 1张图片             │
└───────────────────────────────┴──────────────────────────────────┘

[jackwener]

Thanks for the contribution! I also pushed a small follow-up refactor on your branch to make the publish-surface detection state-based and keep the tests aligned. The new two-step creator center flow support looks solid.