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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@@ -2,5 +2,5 @@
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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 packages/client/ui-theme/README.md
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README.md: a1ff7d840dae86f5da98de1208ecda3b8b62026b
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README.zh.md: 2e034f3173baabb3eea6b4ae670d5070c95480be
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README.md: 88e21fe214ec806b101050949690283d811be36d
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README.zh.md: 4ed45070234acb78a2e5edef52578b504ae53077
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