chore: add pre-commit prettier tooling

[tansawit]

Summary

This PR adds commit-time formatting automation while keeping the existing Prettier formatting policy for docs unchanged.

What changed

• Added husky and lint-staged as dev dependencies.
• Added prepare script in package.json so hooks are installed on dependency install.
• Added lint-staged config to run prettier --ignore-unknown --write on staged files.
• Added .husky/pre-commit hook to execute npx lint-staged.
• Included a minimal formatting fix in home/tools/wallet.mdx so the existing repo-wide prettier --check . CI job remains green under the current policy.

What did not change

• .prettierrc policy remains exactly as before (printWidth: 80, proseWrap: always).
• No repo-wide docs reflow/normalization is included.

Why

• Prevents new Prettier violations from entering PRs by auto-formatting staged files at commit time.
• Avoids broad MDX churn and keeps docs wrapping behavior unchanged.

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✨ Finishing Touches

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