Fleet surfaces round 2: detail-header background leak + dock rail chrome and overflow

Context

Operator gallery review for the Build Week submission (2026-07-21): two rendered defects on the Fleet surfaces, both V-B-A'd live. Round 2 of the film-floor arc (#15628's follow-up; same class as #15629's container-background findings).

Live latest-open sweep: checked latest 20 open issues at 2026-07-21T09:40Z; no equivalent.

The Problems (computed-style evidence)

1. Detail header mismatched background — .fm-detail-header computes rgb(14, 15, 13) (Neo stock container background) while the detail panel below is transparent: the "Agent detail" header strip reads as a differently-dark box. AgentDetail.scss sets no background on the header, so the framework default leaks through — the exact #15629 glitch class in a sibling component.
2. Dock rail tabs loud + overflowing — .neo-dashboard-dock-rail-tab buttons paint rgb(62, 99, 221) (the framework's primary button chrome; nothing in the agentos layer quiets them) and sit at left: 1589 with width 48 — 37px past the 1600px viewport edge: blue slivers with unreadable content at the layout's right edge.

The Fix

1. AgentDetail.scss: .fm-detail-header { background: transparent } (+ sweep .fm-detail-empty, .fm-detail-panes for the same leak).
2. Agentos FM layer: quiet .neo-dashboard-dock-rail-tab (transparent/dim token, NOT the framework file — src/dashboard/Container.scss must stay consumer-neutral).
3. The rail overflow: measure the cockpit's width budget (nav + grid + detail + rail) against the host; fix the layout allocation if it's config-sized, or file the structural finding with evidence.

Acceptance Criteria

• Detail header and panel read as one continuous surface (computed bg transparent on .fm-detail-header).
• Rail tabs render quiet (no primary chrome) in the FM cockpit.
• No cockpit content escapes the host viewport at 1600×1066 (or the structural finding filed with measurements).
• Fleet specs green; synthesis e2e green.

Out of Scope

• Framework-level rail-tab restyle (consumers beyond the FM own that decision).

Related

#15628 (film-floor round 1) · #15629 (merged, same glitch class) · FleetCockpitAutoHideRailNL (the rail's witness)

Origin Session ID: 86adbb95-6d48-4071-8d93-b2355d320a97

Retrieval Hint: detail header background transparent dock rail tab primary chrome viewport overflow film floor round 2