Fix peer/chat flicker and TCP dial log spam

[krwg]

Summary

• Reuse authenticated inbound/outbound sockets for send-tcp-message (no ensurePeerSocket dial logging loop)
• Share stable presence text (shareLine) to LAN without timer churn; overlay keeps live elapsed
• patchSharedPresenceText avoids config-updated renderer churn on every presence tick
• Debounce peers/chat hub full re-render on discovery updates

Test plan

• npm test
• Two instances: peers/chat lists should not flicker; console should not spam reuse inbound lines

Made with Cursor