Compare page's "zero sessions imported" empty state. Renders when
the user navigates to /compare with an empty session library —
Compare can't overlay anything without rows, so the page bails to
an explainer card with a primary Import a session action.
Distinct from the picker stage (which renders when sessions exist
but fewer than two are selected) — that one shows the session list
Compare page's "zero sessions imported" empty state. Renders when the user navigates to
/comparewith an empty session library — Compare can't overlay anything without rows, so the page bails to an explainer card with a primaryImport a sessionaction.Distinct from the picker stage (which renders when sessions exist but fewer than two are selected) — that one shows the session list