Add WebSocket reconnection with backoff

[TheStack-ai]

Context

The orb connects to the brain via WebSocket. If the connection drops, the orb should reconnect automatically with exponential backoff.

What to do

Implement reconnection logic in the orb's WebSocket client:

1. Detect disconnection
2. Retry with exponential backoff (1s, 2s, 4s, 8s, max 30s)
3. Show connection status in the UI

Files to modify

• orb/src/ (WebSocket client)

Difficulty: Medium