Long-running sessions auto-compress: the gateway ends the original session
and surfaces the live continuation under a new id (list_sessions_rich projects
the root forward to its tip). Two symptoms fell out of the id rotation:
- A pinned session "vanished" — the pin is stored as the pre-compression root
id, but the sidebar only matched on the live id, so it was filtered out.
Pins now resolve on the durable lineage-root id (`_lineage_root_id`, already
surfaced by the projection): the sidebar indexes sessions by both ids, pin/
unpin and reorder operate on the durable id, and `sessionPinId()` is shared
with the Cmd+P toggle. Existing pins keep working with no migration.
- A freshly-continued session was missing from the list until you ungrouped +
"load 50 more" — the list paginated by original start time, so an old-but-
active conversation sat past the first page. The desktop now requests
`order=recent` (GET /api/sessions gains an `order` param backed by the
existing recency CTE), surfacing live continuations on the first page.
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