Fix ESLint 9 and Next.js 16 compatibility issues

[Copilot]

eslint-config-next@16.0.10 requires ESLint 9, but the project was on ESLint 8, causing peer dependency conflicts during npm install.

Changes

• Upgraded to ESLint 9 ecosystem:

  • eslint: ^8 → ^9
  • @typescript-eslint/eslint-plugin, @typescript-eslint/parser: ^7.2.0 → ^8.0.0
  • eslint-plugin-react-hooks: ^4.6.2 → ^5.0.0

• Upgraded Next.js to match eslint-config-next version:

  • next: 14.2.4 → 16.0.10

• Migrated to ESLint 9 flat config:

  • Replaced .eslintrc.yml with eslint.config.mjs
  • Updated lint script from next lint to eslint . (Next.js 16 removed the lint command)

• Build configuration:

  • Added --webpack flag to build script (Next.js 16 defaults to Turbopack; project requires webpack for existing config)
  • Added ts-node dev dependency for Jest config

// eslint.config.mjs - new flat config format
import js from "@eslint/js";
import typescriptEslint from "typescript-eslint";

export default [
  js.configs.recommended,
  ...typescriptEslint.configs.recommended,
  // ...
];

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