v3.74.115

Timeline editor and preview hardening. The preview consumes flexible phone height; Cut uses the live playhead and preserves playback; selected clips expose a clear Delete action; ripple deletes retain preview position; autosaves restore silently; editing suggestions provide Not now with a 30-minute cooldown. Clean unit tests, lint, signed APKs, checksums, signing fingerprints, size budgets, distribution metadata, and 16 KB alignment verified locally.