Summary

• reserve space on the right side of the homepage session list
• place the custom scrollbar in the outer gutter, beyond the search and session row edge
• keep session hover and archive states clear of the scrollbar

Validation

• bun typecheck (packages/app)
• bun x prettier --check src/pages/home.tsx
• pre-push monorepo typecheck (29 tasks passed)
• real-app Playwright interaction recording at 760×520, dark theme, reduced motion, with six existing local sessions
• verified search and session rows share a 739px right edge while the scrollbar occupies the separate 739–751px gutter; scrolling geometry stays unchanged