v3.74.114

Preview-space and edit-playback release. The preview now consumes flexible phone height while the bounded timeline and tool dock remain anchored together. Split uses the live frame position, timeline rebuilds resume atomically at the edit point, ripple deletes preserve preview position, and playback restarts after the edited timeline end. Clean unit tests, lint, signed release assembly, checksums, signing fingerprints, size budgets, distribution metadata, and 16 KB alignment all verified locally.