Restore npm run dev

[YASHMAHAKAL]

Notes for Reviewers

• Fix broken webpack-cli v7 flags in dev script (--colors → --color, remove -d)
• Replace deprecated WDS v5 devServer options (disableHostCheck, inline, stats)
• Remove NamedModulesPlugin and HotModuleReplacementPlugin (removed/auto-applied in webpack 5 / WDS v5)
• Remove @mui/@emotion babel-loader rule that converted ESM to CJS, breaking tree-shaking and bloating bundle from 1.3MB to 7.3MB
• Migrate ESLint config from .eslintrc to eslint.config.js (required, ESLint 10 dropped .eslintrc support)
• Note: react/no-typos rule dropped — broken in eslint-plugin-react@7.37.5 under ESLint 10 flat config
• Fix missing semicolons on class field declarations in 6 example files"

Signed commits

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