Build a social media post scheduler called "PostQueue".
- Calendar view (month) showing scheduled posts as colored dots
- Create post modal: text editor, image URL, select platforms (Twitter, LinkedIn, Instagram, Facebook)
- Post preview: shows how it will look on each selected platform
- Drag posts to reschedule on calendar
- Status tags: Scheduled, Published, Draft
- Analytics summary: posts this week, platforms used, upcoming count
- Queue view: chronological list of all upcoming posts
- All data in localStorage
Design: clean white, accent indigo (#6366f1), platform-colored tags (Twitter blue, LinkedIn blue, Insta gradient, FB blue).