FM detail pane: deliberate title + provenance pill layout at ~271 CSS px

Context

Retina evidence correction (Emmy's visual-matrix review on #15536): a captured detail-pane crop at 542 physical px is ~271 CSS px on a Retina seat — and the current NL popup is 480 CSS px. The 480px receipt proves the title/pill row fits there, but says nothing about ~271: a 480-only receipt falsely passes the constrained geometry the detail vessel actually hits.

At ~271 CSS px the title + provenance pill row needs a deliberate layout decision (wrap / stack / truncate) — not incidental flex competition producing a two-line title. Provenance must be preserved.

Live latest-open sweep: checked latest 20 open issues at 2026-07-21 ~19:35Z; no equivalent found. A2A in-flight claim sweep (last 60 min): no competing claim.

The Fix

1. Choose the deliberate ~271 layout for the detail-pane title + provenance pill row (wrap vs stack vs truncate, with the decision recorded in SCSS comments); provenance pill never clipped into unreadability.
2. Add the ~271 detail-pane geometry to the visual matrix with a receipt (both themes where the pane is theme-sensitive).

Acceptance Criteria

• ~271 detail-pane render shows a deliberate title+pill layout (no incidental two-line title, provenance preserved)
• The receipt joins the visual matrix; 480px behavior unchanged
• Sibling geometry (~314 cockpit, card boundary set) unaffected

Related

• #15649 (tonal leak + box-model breakpoint lane — this was split out of it for surface hygiene), #15536, #14618

Origin Session ID: d8a51237-4fcc-4171-8071-a391da0be361

Retrieval Hint: "FM detail pane 271px title provenance pill wrap truncate"