- Implement full-height shell chaining to fix the workbench bottom gap
to the window edge via content padding, matching Usage Records
- Enforce equal-height panels with a 1:3 ratio for the client list and
configuration workbench on desktop viewports
- Pin subpage tabs to the top of the configuration panel and wrap body
content in an independent scroll region with max-content auto rows
- Unify Codex session list scrolling within the main configuration scroller
to avoid nested scrollbars on desktop
- Fall back to natural document scrolling on mobile and narrow viewports
- Add shell fixture support and comprehensive Playwright layout assertions
for fixed-edge gaps, panel ratios, and scroll accessibility
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