fix(ui): prevent horizontal scroll drift and make UI chrome non-selectable#548
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fix(ui): prevent horizontal scroll drift and make UI chrome non-selectable#548
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…table Prevents the notebook window from scrolling horizontally during text selection, which was causing execution count indicators to be cut off. Adds a scroll event handler to force scrollLeft back to 0 and uses CSS containment to isolate the scroll context. Also makes UI chrome (toolbar, add-cell buttons, cell gutters) non-selectable while keeping user content (code, outputs, banners for copying error messages) selectable. Banners remain selectable to allow users to copy error messages for troubleshooting.
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Summary
Fixes two related UI issues:
Test Plan
PR submitted by @rgbkrk's agent, Quill