Implement the following plan:

# Bottom Live Bar + Waiting Room Queue

## Context
Replace the navbar live indicator with a full-width fixed bottom bar visible on all pages. Add a waiting room queue so multiple writers can chain back-to-back, creating an infinite thread of consciousness. When someone is live, everyone sees "WATCH LIVE" linking to pump.fun. After 8 minutes, next queued writer auto-starts.

## Files to modify
- `src/state.rs` — QueueEntry struct, WaitingRoom, extend LiveStatusEvent, add to AppState
- `src/routes/live.rs` — queue endpoints, auto-chain logic, modify agent queueing
- `src/routes/mod.rs` — register queue routes
- `src/main.rs` — init waiting_room
- `templates/base.html` — bottom bar HTML + JS (replaces navbar indicator)
- `templates/home.html` — expose `startCountdown` for auto-trigger
- `static/style.css` — bottom bar styles