printWidth 100 to stay close to the existing hand-formatting; single
quotes; trailing commas. `npm run format` / `npm run format:check`.
The formatting pass itself is the next commit so it stays isolated.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Ve7HLspzeG2xDPtJQ8vmu
