Purpose

Improve consistency and readability across frontend and backend with shared formatting conventions.

Changes

• Configure shared Prettier rules and formatting commands.
• Apply consistent formatting across code and Markdown files.
• Standardize filenames and update imports.
• Document formatting commands in README.

Passed for both frontend and backend:

• npm run format:check
• npm run lint
• npm run build

Frontend: npm test — all 12 tests passed.

Screenshots

Not applicable.

Checklist

• I have reviewed my own changes.
• The changes meet the linked issue's acceptance criteria, where applicable.
• I have verified the changes and recorded the results above.
• I have added or updated tests where needed.
• I have updated documentation where needed.
• I have included screenshots for visual changes, or marked them not applicable.