chore: upgraded eslint to v9 and configure typescript compatible rules

[nafees87n]

Summary by CodeRabbit

• Chores
  • Updated Node.js requirement to 20.20.0.
  • Replaced legacy ESLint setup with a modern flat-style configuration and updated ESLint packages.
  • Added JS/TS linting improvements and global ignore patterns consolidation.
  • Adjusted TypeScript compiler options (skipLibCheck enabled) for more consistent builds.

[coderabbitai]

Walkthrough

Replaces legacy ESLint configuration and ignore file with a Flat Config setup: adds eslint.config.js and removes .eslintrc.js and .eslintignore. Updates ESLint and related devDependencies in package.json and adds the globals package. Bumps Node target in .nvmrc from 16.15.0 to 20.20.0. Updates tsconfig.json to add skipLibCheck and exclude node_modules. Removes several ESLint disable comments in three source files. No functional application logic was introduced.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: upgrading ESLint to v9 and configuring TypeScript-compatible rules as evidenced by the package.json (ESLint ^9.39.2), eslint.config.js (new FlatCompat configuration), and TypeScript-related configuration updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/eslint

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[coderabbitai]

Actionable comments posted: 3

🤖 Fix all issues with AI agents

In @.nvmrc:
- Line 1: Update the README.md Node.js version reference from 16.15.0 to match
.nvmrc (20.20.0): find the line in README.md that mentions "Node.js 16.15.0" and
replace it with "Node.js 20.20.0" and optionally add a short note to reference
the .nvmrc file as the authoritative runtime version.

In `@eslint.config.js`:
- Around line 35-37: Remove the undefined "prettier/prettier" rule from the
rules object in eslint.config.js (the entry currently set to "off") because
eslint-plugin-prettier is not installed; either delete that rule line from the
rules block or, if you prefer to keep it, add eslint-plugin-prettier to
devDependencies and register it in the flat config so the "prettier/prettier"
rule is available.
- Line 33: The config currently assigns compat.extends(...) to an extends
property inside a config object (see usage of compat.extends in
eslint.config.js), but FlatCompat returns an array that must be spread into the
top-level config array; fix by removing the extends property from those config
objects and instead spread ...compat.extends(...) directly into the exported
top-level array where other config entries live (apply the same change for both
occurrences of compat.extends at the two locations).