chore: upgrade to React 17 with v7.0.0 release

[iamdarshshah]

🚀 React 17 Migration (v7.0.0)

This PR modernizes the library to support React 17 as the minimum version, along with updating the entire toolchain to current standards.

What Changed

React & Dependencies

• Bumped peerDependencies to React 17.0.0+
• Updated devDependencies to React 17.0.2
• Switched to the new JSX transform ("jsx": "react-jsx") — no more import React needed in every file

Testing & Tooling

• Upgraded Jest from v24 → v29
• Updated @testing-library/react to v12.1.5 (last version supporting React 17)
• Modernized Husky to v9 (new .husky/ directory setup)
• Pinned lint-staged to v15 for Node 18 compatibility

CI/CD & Node.js

• Updated GitHub Actions to test on Node 18.x, 20.x, and 22.x
• Dropped Node 16 support (EOL since September 2023)
• Added engines.node: ">=18.18.0" to enforce minimum version

Why This Matters

React 16 reached end-of-life, and the ecosystem has moved on. By setting React 17 as our baseline:

• We can use modern React patterns and the new JSX transform
• Our dependencies stay compatible with actively maintained versions
• Users on React 18+ are fully supported (React 17 APIs are forward-compatible)

Breaking Changes

Before (v6)	After (v7)
React 16+	React 17+
Node 12+	Node 18.18.0+

Migration Guide

If you're on React 16, you'll need to upgrade to React 17 or later before using v7 of this library:

npm install react@17 react-dom@17

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.33%. Comparing base (b48b0ae) to head (17cc499).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   75.46%   79.33%   +3.87%     
==========================================
  Files           2        2              
  Lines         163      150      -13     
  Branches       61       56       -5     
==========================================
- Hits          123      119       -4     
- Misses         16       24       +8     
+ Partials       24        7      -17     

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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