fix(deps): update react monorepo to v19

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@types/react (source)	^18.0.26 → ^19.0.0
@types/react-dom (source)	^18.0.10 → ^19.0.0

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: package-lock.json

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR! 
npm ERR! While resolving: @astrojs/react@2.3.2
npm ERR! Found: @types/react@19.2.17
npm ERR! node_modules/@types/react
npm ERR!   @types/react@"^19.0.0" from the root project
npm ERR!   peer @types/react@"^19.2.0" from @types/react-dom@19.2.3
npm ERR!   node_modules/@types/react-dom
npm ERR!     @types/react-dom@"^19.0.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer @types/react@"^17.0.50 || ^18.0.21" from @astrojs/react@2.3.2
npm ERR! node_modules/@astrojs/react
npm ERR!   @astrojs/react@"^2.0.0" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: @types/react@18.3.31
npm ERR! node_modules/@types/react
npm ERR!   peer @types/react@"^17.0.50 || ^18.0.21" from @astrojs/react@2.3.2
npm ERR!   node_modules/@astrojs/react
npm ERR!     @astrojs/react@"^2.0.0" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /runner/cache/others/npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /runner/cache/others/npm/_logs/2026-07-21T18_03_26_601Z-debug-0.log