The rpc-client has always emitted a detailed connection lifecycle log
(dials, timeouts, close codes, handshake steps, retries) via onLog, but
only the pairing screen wired it up — for long-lived host connections
everything went to console.log, invisible to users. Debugging reports
like #7824/#6928 meant asking reporters for facts the app already knew.
- connection-log-buffer: bounded (200/host) module-level ring buffer with
referentially-stable snapshots for useSyncExternalStore; survives
client swaps and provider remounts.
- client-context: wire onLog for every shared host client.
- connection-log screen: live per-host log (reuses the pairing
ConnectionLog component), host picker, and a Copy Diagnostics button
that bundles app/platform versions, endpoint (flagged if Tailscale),
state, attempt count, last-connected, and the event log into one
shareable blob.
- troubleshoot: 'View connection log' entry point.
Co-authored-by: Orca <help@stably.ai>
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