Renders every `components/ui` primitive under each of the three themes at
`/gallery.html`, reachable under `bun run dev` with no backend.
Unit tests assert structure and ARIA. They cannot tell whether a token
resolves to a readable color, whether an overlay lands above the thing it
is meant to cover, or whether an entrance animation actually plays. Three
defects surfaced here that had a full green suite behind them:
- `Button` and `IconButton` swallowed refs, so `Tooltip` had nothing to
measure and `Dropdown` could not return focus. Console warning only.
- The light theme's warning badge sat at 2.66:1.
- `Dropdown`'s Escape closed the dialog behind it as well.
Vite's build input is `index.html` alone, so this never enters the
production bundle.
