feat: upgrade to @rspress/core v2

[SoonIter]

Summary

Upgrade the CodeSandbox template from rspress v1 to v2.

Changes

• Update rspress dependency from rspress: ^1.0.0 to @rspress/core: ^2.0.3
• Add React 19 dependencies (react, react-dom)
• Add "type": "module" for ESM support
• Update import from 'rspress/config' to '@rspress/core'
• Upgrade tsconfig.json to v2 standards

Related

• Discussion #3195

• refactor(create-rspress): update template to match latest Rspress features and structure rspress#3226

[Copilot]

Pull request overview

This PR updates the project to a more modern ESM + TypeScript configuration and begins migrating the Rspress integration to the @rspress/core package.

Changes:

• Expand tsconfig.json with stricter type-checking and bundler/ESM-oriented module settings.
• Update rspress.config.ts imports to use Node’s node: prefix and @rspress/core.
• Switch the package to ESM ("type": "module") and update dependencies toward the newer Rspress/React/Node types stack.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tsconfig.json	Adds modern TS compiler options, strictness, and MDX checking config.
rspress.config.ts	Updates imports to Node built-ins and the new Rspress config entrypoint.
package.json	Marks the package as ESM and changes dependency set toward @rspress/core + React typings/runtime.

Comments suppressed due to low confidence (1)

rspress.config.ts:6

• With "type": "module" in package.json, this config will be evaluated as ESM in Node; __dirname is not defined in ESM modules. This will throw at runtime when Rspress loads the config. Replace __dirname usage with an ESM-safe directory derivation (via import.meta.url + fileURLToPath) or another approach supported by Rspress.

import * as path from 'node:path';
import { defineConfig } from '@rspress/core';

export default defineConfig({
  root: path.join(__dirname, 'docs'),
  title: 'Rspress',

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