Update react monorepo to v19.2.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
react (source)	19.2.3 → 19.2.6
react-dom (source)	19.2.3 → 19.2.6

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Release Notes

facebook/react (react)

v19.2.6: 19.2.6 (May 6th, 2026)

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React Server Components

• Type hardening and performance improvements
  (by @​eps1lon and @​unstubbable)

v19.2.5: 19.2.5 (April 8th, 2026)

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React Server Components

• Add more cycle protections (#​36236 by @​eps1lon and @​unstubbable)

v19.2.4: 19.2.4 (January 26th, 2026)

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React Server Components

• Add more DoS mitigations to Server Actions, and harden Server Components (#​35632 by @​gnoff, @​lubieowoce, @​sebmarkbage, @​unstubbable)

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