Build a social media post scheduler UI:
- Calendar view showing scheduled posts
- Create post: text, image URL, select platforms (Twitter, LinkedIn, Instagram, Facebook)
- Character count with platform-specific limits
- Preview how the post looks on each platform
- Drag and drop to reschedule on calendar
- Post status: draft, scheduled, published
- Hashtag suggestions based on content
- Best time to post recommendations
- All data in localStorage
Note: this is a UI/planning tool, not actual posting. Put in ~/data/public/