fix(app): style native scrollbars to match the theme#2473
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The app showed the raw OS scrollbar — square, flat, and jarring against the app design, especially in long conversations. Style the WebKit scrollbar globally: 8px wide, pill-shaped thumb, transparent track, subtle inset border for depth. The thumb uses the slate alpha tokens, which flip with the theme, so it reads as a translucent gray on both light and dark surfaces. Custom ScrollArea components and no-scrollbar opt-outs are unaffected. Fixes different-ai#2444
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Summary
Fixes #2444
The desktop app currently renders the raw OS scrollbar — square corners, flat, visually out of place against the app design, most noticeably in long conversations and thinking sections.
This adds global WebKit scrollbar styling in
apps/app/src/app/index.css, matching the spec in the issue:border-radius: 9999px) with a subtle inset border for depth--slate-a6,--slate-a8on hover), which the palette flips per theme — so it's a translucent dark gray on light surfaces and a translucent light gray on dark surfaces, rather than the issue's hardcodedrgba(255,255,255,…)which would only suit dark modeRadix
ScrollAreacomponents draw their own scrollbars andno-scrollbaropt-outs hide theirs entirely; neither is affected by these rules.Testing
pnpm build— clean; verified all five::-webkit-scrollbar*rules are present in the emitted CSS bundlebun test tests/— 110 pass, 0 failCould not capture a recording in this environment; the quickest manual check is opening any long conversation and comparing the scrollbar in both themes.