Problem: The HeaderToolbar in Neo.grid.Container can be scrolled out of view when the GridBody receives focus or is subjected to scrollIntoView(). This occurs because the parent container has overflow: hidden, which browsers still treat as scrollable programmatically (e.g., to align a focused child).

Solution: Use the modern CSS property overflow: clip (specifically overflow-y: clip) instead of hidden. This strictly prevents all scrolling on that axis, including programmatic scrolling, making the layout resilient to focus/scrollIntoView interactions without relying on JavaScript preventScroll hacks.

Scope:

1. Modify resources/scss/src/grid/Container.scss.
2. Update .neo-grid-wrapper and .neo-grid-container to use overflow-y: clip.
3. Verify this does not regress intended scrolling within GridBody.

Note: This is a "Side Quest" improvement for grid layout robustness.