Set up pre-commit hooks

What you end up with

• A Husky pre-commit hook
• lint-staged running Prettier over the staged files
• A Prettier config, if the repo lacks one
• typecheck and test scripts invoked from the hook

Steps

1. Detect the package manager

Look for a lockfile: package-lock.json (npm), pnpm-lock.yaml (pnpm), yarn.lock (yarn), or bun.lockb (bun). Use whichever is present, and fall back to npm when none is clear.

2. Install the dev dependencies

Add as devDependencies: