Summary

• remove the 200 ms background/color transition from legacy select rows
• make model variant hover feedback follow the pointer immediately
• preserve existing highlighted, selected, and keyboard behavior

Root cause

The composer variant picker uses the shared legacy Select. Its option rows animated background-color and color for 200 ms, so the previous highlight faded out while the next faded in as the pointer moved between variants. No expensive model or composer work was occurring on hover.

Validation

• compared the real Select Storybook story at origin/dev and this branch with identical state and pointer interactions
• verified computed transition duration changes from 200 ms to 0 ms
• verified pointer hover, ArrowDown highlighting, Escape dismissal/focus restoration, and pointer selection
• bun run typecheck in packages/ui
• bun test src --only-failures in packages/ui (4 passed)
• bunx prettier --check packages/ui/src/components/select.css
• git diff --check

The monorepo pre-push typecheck currently fails in unchanged packages/tui/src/context/data.tsx; the same failure reproduces on clean origin/dev. The affected packages/ui checks pass.