Community Platform

Build a community platform with the following features:

**Discovery:**
- Homepage showing Latest and Trending threads in a two-column layout
- Category filter in a sidebar: Announcements, General, Help, Show & Tell, Off Topic
- Search bar that searches thread titles and body content

**Threads:**
- Create a new thread: title, category, body (rich text with basic markdown — bold, italic, links, code blocks, images)
- Thread detail page: original post, threaded replies (up to 2 levels deep), upvote button on every post, reply editor at the bottom
- Mark best answer (for Help category)
- Close/lock thread (mods only)

**Members:**
- Sign up with email + chosen username + avatar upload
- Profile page: avatar, bio, joined date, thread count, reply count, badges earned
- Follow other members; feed of "threads from people I follow"

**Gamification:**
- Badges earned for: First Post, 10 Replies, Helpful (5 upvotes on one reply), Regular (posted 10 days in a month)
- Reputation points: +2 for upvote, +10 for best answer
- Leaderboard page: Top members this week

**Moderation:**
- Report a post — mods see a queue
- Mod role can edit/delete any post, close threads, ban users

**Design:**
- Clean, readable typography (serif for body, sans for UI)
- Light by default, dark mode toggle
- Mobile-friendly — threading collapses cleanly on small screens

Store everything in Supabase. Real-time updates for new replies using Supabase Realtime. RLS so deleted users' content is hidden but not hard-deleted.