Multicast only finds peers on the same LAN. Reach off-LAN boxes by probing
them directly over unicast (works over any routable address; Tailscale is the
easy, secure choice):
- discovery.Probe: unicast POST /register (https->http fallback) with a two-way
handshake, so send and receive both work; offline peers age out.
- internal/tailscale: Peers() shells `tailscale status --json` for online peers.
- config.KnownPeers: persisted manual remotes.
- main.go: watchRemotes goroutine probes knownPeers ∪ tailscale peers every 10s,
in both the normal TUI path and quick-send.
- TUI: `+` on Devices opens an add-remote modal (host/IP/Tailscale name).
- install.sh: interactive local/remote install prompt; remote mode locks port
53317 to the Tailscale interface (ufw), with container/userspace-networking
detection. README documents remote devices.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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