Implemented and stabilized hand-based viewport interaction. The system now supports a screen-space hand cursor controlled by the index finger, pinch-based selection of vertices, edges, and faces, and two-hand gesture editing. Vertex movement is working, while edge and face movement are being integrated by transforming their underlying mesh vertices. Object Mode gestures for movement, rotation, and scaling remain functional. The next focus is completing reliable hand-based edge/face manipulation and improving pinch-based selection accuracy.