<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Fixes scrollbar flickering in annotator mode by constraining draggable
inputs within the container and suppressing scroll during drag for
smoother movement.

- **Bug Fixes**
- Added containerRef to DraggableTextInput and elementRef to calculate
bounds.
- Constrained drag coordinates to container size and accounted for
scale.
- Prevented default and stopped propagation on mousemove to avoid scroll
jitter.
  - Passed containerRef from Annotator to DraggableTextInput.

<sup>Written for commit 959605ddaa5faf23252ee797bf206c6dff46a069.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->