Feature/add react 19 support

examples/next-js/.gitignore

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+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

examples/next-js/README.md

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+# Next.js Example (Hexa UI + React 19)
+
+Example app that runs the **Hexa UI** family on **Next.js 16** with **React 19**, to verify the ecosystem works in a Next.js App Router app on React 19.
+
+## ⚠️ Known limitations (React 19)
+
+- **antd** (used by hexa-ui): still uses `ReactDOM.render`, removed in React 19; you may see a runtime warning.
+- **react-sortable-hoc** (used by hexa-ui Table): uses `findDOMNode`, removed in React 19; table column reorder may show warnings.
+- These come from Hexa UI’s dependencies. The example builds and runs for verification.
+
+## Key dependencies
+
+- **Next.js** `16.1.6`, **React** / **React DOM** `^19`
+- `@kaspersky/hexa-*` packages (hexa-ui, hexa-ui-charts, hexa-ui-core, hexa-ui-icons)
+- **antd** `4.18`, **styled-components** `6.1.8` (Hexa UI peers)
+- Global styles: antd prebuilt CSS (`antd/dist/antd.css`), font and box-sizing in `globals.css`
+
+## Commands
+
+Until Hexa UI packages declare React 19 in `peerDependencies`, install with:
+
+```bash
+npm install --legacy-peer-deps
+npm run dev    # http://localhost:3000
+npm run build
+npm run start
+```

examples/next-js/eslint.config.mjs

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+import { defineConfig, globalIgnores } from 'eslint/config'
+import nextVitals from 'eslint-config-next/core-web-vitals'
+import nextTs from 'eslint-config-next/typescript'
+
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  ...nextTs,
+  globalIgnores([
+    '.next/**',
+    'out/**',
+    'build/**',
+    'node_modules/**',
+    'next-env.d.ts'
+  ])
+])
+
+export default eslintConfig

examples/next-js/next.config.ts

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+import type { NextConfig } from 'next'
+
+const config: NextConfig = {
+  transpilePackages: ['@kaspersky/hexa-ui', '@kaspersky/hexa-ui-charts', '@kaspersky/hexa-ui-icons', '@kaspersky/hexa-ui-core'],
+  compiler: {
+    styledComponents: true
+  },
+  turbopack: {
+    root: process.cwd()
+  }
+}
+
+export default config