feat(web): draw the sidebar's scrollbar only under the pointer
The session list overflows after a handful of sessions, and its scrollbar was drawn permanently in a column that is at rest most of the time. SidebarRoot now tracks the pointer over the whole column and rebinds ui-theme's scrollbar indirection pair to `transparent` while it is outside, keeping the thumb for 2s after the pointer leaves so it does not blink out on the way past. Rebinding colour leaves the list's `scrollbar-gutter: stable` reservation in force, so revealing the bar moves no row. ui-theme's gate now states the widened contract: a rebind targets an -l2 token pair or `transparent`, and nothing else.
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# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-04-pointer-revealed-sidebar-scrollbars.md
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2026-08-04-pointer-revealed-sidebar-scrollbars.md: fdc68fc0eda0aa68b3ec09d93df4a313f39f6d35
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2026-08-04-pointer-revealed-sidebar-scrollbars.zh.md: 8b11aec961a713fe5e07046dee7473fa34471689
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