Markmap test

This block renders a mindmap directly from markdown headings.
If rendering fails, you will only see raw code.

# TrendRadar Improvement Plan v1.0
## P0 Immediate
### 1-1 Top-heavy internal links
- Link only in top 50%
- Allow partial keyword matching
- Limit one link per URL
### 1-2 Visual layer expansion
- Flexible Mermaid insertion
- Flexible Markmap insertion
- Hugo shortcode callouts
## P1 Near-term
### 3-1 Manual freshness button
- Pick one old post
- Pull latest headline
- Append one-line summary
## On hold
### 2-2 Topical silo writing
### 3-2 Drip-feeding scheduler
### 3-3 Telegram outreach bot

Validation checklist

• Tree hierarchy renders correctly
• Longer labels stay readable
• Contrast remains clear in light/dark mode