UI Only

When you're changing how something looks or interacts: get the UI right first. Don't burn turns on tsc, lint, or commit until they say it's good.

Don't run yet

Until they like the UI (or explicitly say to clean/commit):

• tsc / typecheck / npm run build as a finish step
• eslint / prettier / biome
• full test suites just to greenlight a commit
• git commit / git push / opening the PR as done

Dev server, screenshots, and targeted runs needed to see or use the UI are fine. Don't start a dev server the user already has running — assume it's up unless told otherwise. Keep debug logging in place while something's still broken; remove it only once it works.