`session.info` claimed the cwd for whatever the selection happened to be, so a
background tile's payload could re-point a fresh draft at the tile's workspace.
Treat a nonempty `stored_session_id` as non-matching when no primary session is
selected; only an ABSENT id uses the selected-session fallback (the backend
omits it on a lazy session, and refusing there would leave the workspace
un-owned for the rest of the conversation).
Matching goes through the lineage rather than raw string equality: the backend
id is the live session_key, which auto-compression rotates to the continuation
tip, while a selection made from a pinned row holds the stable lineage root.
Comparing those literally reads one conversation as two.
Co-authored-by: ZHJay <ZHJay@users.noreply.github.com>
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