maint: normalize desktop density and touch sizing

[karngyan]

Summary

• tighten command, select, and filter picker rows on desktop
• expand typography and hit targets for coarse pointer input
• reduce excess height in component catalog cards

Validation

• pnpm test
• pnpm typecheck
• pnpm format:check
• pnpm test:a11y
• Playwright geometry checks at desktop and phone viewports

Stack

Depends on #13.