The transition started with no from-frame, so BlendFrame returned the new scene at once. Start now requests a capture and the frame pump supplies its last output on the next tick. Test: TransitionFadeTests. Docs: ai.md, TASKS.md. Not pushed.
- Sliding pill toggle (green ON / red OFF) replaces checkbox - Geometry mismatch error for custom backgrounds - Backdrop -> Background: C# rename, SQL column rename with migration - Source.IsBackground: new -> override (fixes WPF binding) - Legacy 'Backdrop' display name migrated to 'Background' - Per-scene UseDefaultBackground + CustomBackgroundPath - Asset files renamed backdrop -> background - StagedScene/LiveScene split, thumbnail strip, edit gating - TransitionService (Cut/Fade/Move) - Context menu: Capture Desktop, Refresh Desktop - Resolution badge removed, ON-AIR status light added