When using Lexical v0.37.0 with React Server Components (RSC), the following warning appears:

Missing getServerSnapshot, which is required for server-rendered content.

This occurs in @lexical/react/LexicalReactExtension.dev.mjs where useSyncExternalStore is called without the required getServerSnapshot function, causing hydration issues in RSC environments.

Steps to reproduce:

1. Use Lexical v0.37.0 in a RSCapp.
2. Render a Lexical editor or extension.
3. Observe the warning in the console.

Expected behavior:
Lexical should provide a getServerSnapshot function to useSyncExternalStore to ensure compatibility with RSC.