docs: refresh README and CONTRIBUTING for setup and pre-PR checks

[tarunsinghofficial]

Updated README and CONTRIBUTING files for better readability and usage.

Summary by CodeRabbit

• Documentation
  • Added environment validation steps to development setup instructions.
  • Clarified commands for starting the app and running tests, linting, and pre-push checks.
  • Updated pull request guidance with recommended validation steps.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 44262201-73d6-4798-9e6c-86a862b2e2e0

📥 Commits

Reviewing files that changed from the base of the PR and between 1fd4dd8 and 2771418.

📒 Files selected for processing (2)

• CONTRIBUTING.md
• README.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

Contributor documentation now explains environment validation before development startup and documents lint, test, and pre-push checks.

Changes

Contributor documentation

Layer / File(s)	Summary
Setup and development checks CONTRIBUTING.md, README.md	Setup instructions add environment-file creation, npm install, npm run validate-env, and npm run dev. The documentation also lists lint, test, and pre-push commands.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 27714

This change only refreshes project documentation and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the documentation updates for setup instructions and pre-PR checks.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-contributing-refresh

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[coveralls]

Coverage is 93.248% — docs/readme-contributing-refresh into develop. No base build found for develop.