I reviewed the sidebar overflow fix and don't see any blocking issues in the implementation.

The change makes sense end-to-end: the expanded sidebar can now shrink within the flex layout, the tab strip falls back to horizontal scrolling instead of compressing the buttons, the collapse control is protected from shrinking away, and drag-resize is capped by the actual available container width rather than only the global max width.

The main remaining risk is UI regression coverage rather than code correctness. I'd recommend manually verifying a few edge cases before merge:

• very narrow desktop widths, especially around the sidebar minimum width
• dragging the sidebar to its max in a narrow window, then expanding the window again
• tab bar behavior with longer localized labels to confirm horizontal scrolling still feels usable

From the code side, this looks good to me.