`$currentCwd` is a global singleton, but a conversation switch publishes the
new stored session id immediately while the new workspace only arrives when
`session.resume` settles. For that whole window the path still names the
PREVIOUS conversation, and every workspace-derived surface treats it as
authoritative.
Track WHICH conversation the live path describes instead of trying to keep the
path itself in lockstep. Ownership — not emptiness — is what makes the switch
atomic: clearing the path would collapse the workspace/review panes and drop
file-tree state on every switch, so the path stays put and is simply marked
not-yet-owned.
The released marker is deliberately not `null`: `null` MATCHES a fresh draft
(whose selected id is also null), so releasing to it would hand a leftover path
to the draft as its own workspace.
Co-authored-by: ZHJay <ZHJay@users.noreply.github.com>
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