Render checklist details in an anchored floating panel with bounded scrolling, outside dismissal and Escape focus restoration. Reuse the shared overlay mechanism and update layout documentation and regression coverage.
Validation: 25 focused tests, Electron checklist layout and keyboard scenarios, and lint passed. Full-suite and typecheck blockers outside this change were reported separately.
Release note: Runtime execution checklists now expand in a floating panel without pushing conversation content down.
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