The config-layout used a uniform margin: -16px that did not match the
parent .content padding (12px 16px 32px), causing the right edge of the
actions bar—including the Save button—to extend into the overflow-hidden
region on systems with non-overlay scrollbars (e.g. Ubuntu/GTK).
Changes:
- Match negative margin to actual .content padding (-12px -16px -32px).
- Use overflow: clip instead of overflow: hidden on .config-main so it
does not create a scroll container that shifts the stacking context.
- Add flex-shrink: 0 and position: relative on .config-actions to
guarantee the actions bar is never collapsed or layered behind the
scrollable content area.
Closes#31658
20c36f7e84