fix: add SSR guard to MethodEndpoint for React 19 compatibility

[stuartbuckell]

Summary

This PR fixes build and hydration failures when using React 19 with Docusaurus, addressing multiple compatibility issues.

Problems Fixed

1. Redux Context Unavailable During SSR/Hydration

When building with React 19, the static site generation (SSR) and client-side hydration fail with:

TypeError: Cannot read properties of null (reading 'store')
    at useSelector (server.bundle.js:...)

2. Empty oneOf/anyOf Arrays Cause Tab Errors

OpenAPI specs with empty oneOf or anyOf arrays (e.g., "oneOf": []) cause:

Docusaurus error: the <Tabs> component requires at least one <TabItem> children component

Solutions

Redux Hook Wrappers (hooks.ts)

Wrap useTypedDispatch and useTypedSelector with try-catch blocks to gracefully handle cases where the Redux context is unavailable:

• useTypedDispatch: Returns a no-op function when context is unavailable
• useTypedSelector: Returns undefined when context is unavailable, then updates via useEffect once the context becomes available

Empty Schema Array Guard (Schema/index.tsx)

Added early return in AnyOneOf component when oneOf/anyOf array is empty or undefined.

SchemaTabs Empty Children Guard (SchemaTabs/index.tsx)

Added guards to handle empty or null children before passing to sanitizeTabsChildren:

• Filters out null/undefined children before processing
• Wraps sanitizeTabsChildren in try-catch
• Returns null if no valid children exist

Related Issues

• Partially addresses Update docusaurus-theme-openapi-docs dependencies for React 19 compatibility #1130 (React 19 compatibility)

Testing

Tested with:

• Docusaurus 3.9.2
• React 19.2.0
• docusaurus-theme-openapi-docs 4.5.1

Both npm run build and client-side navigation now work without crashes, including pages with empty oneOf/anyOf schemas.