Update the React example

[16adianay]

No description provided.

[Copilot]

Pull request overview

This PR updates the React example by moving it to a Vite + TypeScript setup and implementing a DropDownBox example with search over an embedded TreeList, along with linting and test tooling.

Changes:

• Added Vite/Vitest configuration, TypeScript project references, and ESLint/Stylelint setup for the React example.
• Implemented the DropDownBox + TreeList UI (with selection reducer) and supporting data/search service utilities.
• Added a basic React Testing Library test scaffold and setup file.

Reviewed changes

Copilot reviewed 22 out of 29 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
React/vitest.config.ts	Adds Vitest configuration (jsdom, globals, setup file).
React/vite.config.ts	Adds Vite configuration with React plugin.
React/tsconfig.node.json	Adds TS config for Node-side tooling files (Vite/Vitest configs).
React/tsconfig.json	Adds TS solution-style project references.
React/tsconfig.app.json	Adds TS config for the app source (bundler mode, strict).
React/stylelint.config.mjs	Adds Stylelint config based on eslint-config-devextreme.
React/src/vite-env.d.ts	Adds Vite client type reference.
React/src/setupTests.ts	Adds Testing Library jest-dom setup.
React/src/service.ts	Adds data sources/stores and search/filter helpers for the demo.
React/src/main.tsx	Adds React entrypoint wiring to #root.
React/src/index.css	Adds base page styling.
React/src/components/DropDownList/selectionReducer.ts	Adds reducer for dropdown/tree selection state.
React/src/components/DropDownList/DropDownList.tsx	Implements DropDownBox with embedded TreeList + search behavior.
React/src/assets/react.svg	Adds React logo asset.
React/src/App.tsx	Adds main demo UI + search options controls.
React/src/App.test.tsx	Adds initial test scaffold (currently mismatched to UI).
React/src/App.css	Adds demo layout styling.
React/README.md	Adds React example README with build/lint instructions.
React/public/vite.svg	Adds Vite logo asset.
React/public/robots.txt	Adds robots.txt.
React/public/manifest.json	Adds web app manifest.
React/package.json	Adds React example package/scripts/dependencies.
React/index.html	Adds Vite HTML entry.
React/eslint.config.js	Adds ESLint flat config for TS/React and devextreme rules.
React/.gitignore	Adds React project gitignore.

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[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

Non-zero exit code when running test file

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-implement-search-for-treelist_25.2.6+/28/console

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

Non-zero exit code when running test file

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-implement-search-for-treelist_25.2.6+/30/console

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

Non-zero exit code when running test file

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-implement-search-for-treelist_25.2.6+/31/console

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

Non-zero exit code when running test file

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-implement-search-for-treelist_25.2.6+/32/console

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

Non-zero exit code when running test file

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-implement-search-for-treelist_25.2.6+/33/console