Duplicating an SSH tab ("Copy Tab") used to open a brand-new SSH
connection, forcing a second MFA prompt on hosts with multi-factor auth.
Like Tabby's session multiplexing, open a new shell *channel* on the
source tab's already-authenticated connection instead, so the duplicate
reuses the existing transport and skips key exchange + authentication.
- copySession records the source session id (reuseConnectionFromSessionId)
for connected, non-mosh SSH sessions; it is threaded down to the SSH
bridge as options.sourceSessionId.
- startSession.cjs gains a reuse path that opens conn.shell() on the
source connection. The shell wiring is extracted into a shared
setupShellSession helper used by both the fresh and reuse paths.
- Connection lifecycle is reference-counted via a new sshConnectionPool
module (mirrors Tabby ref/unref/destroy): the shared transport + jump
host chain are torn down only when the last channel closes, so closing
a copy — or the original while a copy is open — never kills siblings.
terminalBridge.closeSession routes SSH teardown through the same release.
- Reuse falls back to a fresh connection when the source is gone, and is
skipped for X11 hosts (X11 is negotiated per channel).
Tests: sshConnectionPool refcount unit tests, bridge reuse integration
tests (reuse vs fresh, sibling survival, X11 skip, fallback), and
terminalBridge close lifecycle tests.
Refs #1204
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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