feat(deps)!: bump to react@19 and react-dom@19 by default

[SoonIter]

Summary

react@19 and react-dom@19

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Timeless0911]

react is the peerDependencies of @rspress/plugin-preview, we should update the peer range if we no longer support react 17.

[colinaaa]

We are getting an error when upgrading to Rspress v2.0.0-beta.0:

website
└─┬ @rspress/runtime 2.0.0-beta.0
  └─┬ react-helmet-async 2.0.5
    └── ✕ unmet peer react@"^16.6.0 || ^17.0.0 || ^18.0.0": found 19.1.0 in @rspress/runtime
hint: If you don't want pnpm to fail on peer dependency issues, add "strict-peer-dependencies=false" to an .npmrc file at the root of your project.

lynx-family/lynx-stack#570 (comment)

Should we just ignore the error? Or could Rspress handle this (e.g.: bundle react-helmet-async to avoid using it in dependencies)?

Ref: staylor/react-helmet-async#239