Replace useGatewayStore, useHubStore, useDeviceId, and useHubInit with:
- ConnectionStore: WebSocket lifecycle, deviceId persistence via Zustand persist,
fetch message history on registration via getAgentMessages RPC
- MessagesStore: simplified to current-agent-only, sendMessage accepts SendContext
to break circular import with ConnectionStore
- useAutoConnect: returns { loading } for skeleton UI, skips connect if already
connected (fixes Electron tab-switch reconnect), no cleanup disconnect
Removes: gateway.ts, hub.ts, hub-init.ts, device-id.ts, sonner dep from store
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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