Improved character dragging in Story Editor. Characters now move smoothly during drag using a local visual preview, then commit the final position once the drag ends. Fixed transform keyframe drag commit behavior. Moving a character on a selected transform keyframe now correctly saves the new keyframe position instead of snapping back to the old position. Fixed expression keyframe timeline persistence. Expression markers now remain visible/selected correctly when navigating or tapping elsewhere on the timeline. Improved timeline keyframe undo consistency. Transform and expression keyframes now restore their selected marker state correctly during undo/redo, so mixed keyframe actions undo in the expected chronological order. Preserved Story Editor architecture. No changes were made to playback, export, rendering pipeline, keyframe data models, or timeline structure.