[AndySparks]

Summary

• Keep the writing canvas at its existing 46.5rem measure.
• Let the review rail grow from 18rem to 30rem as larger displays provide room.
• Cap comment text near a 65-character measure after accounting for padding and the avatar gutter.
• Add a browser regression covering both the unchanged writing canvas and responsive comment rail.

Why

Long review comments currently remain in an 18rem rail even on very large displays, producing a tall, narrow column while substantial horizontal space is unused. This makes comments easier to read without changing the writing experience.

Browser measurements

Viewport	Writing canvas	Comment rail
1440px	744px	288px
2560px	744px	480px

Verification

• pnpm check
• pnpm test:smoke — 12 passed
• pnpm test:coverage
• Focused Playwright viewport regression

GitHub Actions is awaiting first-time contributor approval. The same CI commands passed locally under the repository's pnpm 10 environment. The Vercel preview also requires Lex team authorization for external forks.

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