Beacon 0.12.0

• Beacon has a new graphite pilot-light design, with clearer idle, working, waiting, and ready-to-close states at every size.
• Switching between Claude and Codex now keeps the focus ring on the session actually in front, and automatic handoffs no longer drift to another app.
• Delegated agents stay grouped under their parent session, with a live count for background work and more detail on hover or in the session list.
• Hidden or continued sessions return when real work restarts, and stopping a work timer now responds immediately while its report finishes loading.