chore(deps): bump react from 19.1.1 to 19.2.0 in /testsite

[dependabot]

Bumps react from 19.1.1 to 19.2.0.

Release notes

Sourced from react's releases.

19.2.0 (Oct 1, 2025)

Below is a list of all new features, APIs, and bug fixes.

Read the React 19.2 release post for more information.

New React Features

• <Activity>: A new API to hide and restore the UI and internal state of its children.
• useEffectEvent is a React Hook that lets you extract non-reactive logic into an Effect Event.
• cacheSignal (for RSCs) lets your know when the cache() lifetime is over.
• React Performance tracks appear on the Performance panel’s timeline in your browser developer tools

New React DOM Features

• Added resume APIs for partial pre-rendering with Web Streams:
  • resume: to resume a prerender to a stream.
  • resumeAndPrerender: to resume a prerender to HTML.
• Added resume APIs for partial pre-rendering with Node Streams:
  • resumeToPipeableStream: to resume a prerender to a stream.
  • resumeAndPrerenderToNodeStream: to resume a prerender to HTML.
• Updated prerender APIs to return a postponed state that can be passed to the resume APIs.

Notable changes

• React DOM now batches suspense boundary reveals, matching the behavior of client side rendering. This change is especially noticeable when animating the reveal of Suspense boundaries e.g. with the upcoming <ViewTransition> Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics.
• Add Node Web Streams (prerender, renderToReadableStream) to server-side-rendering APIs for Node.js
• Use underscore instead of : IDs generated by useId

All Changes

React

• <Activity /> was developed over many years, starting before ClassComponent.setState (@​acdlite @​sebmarkbage and many others)
• Stringify context as "SomeContext" instead of "SomeContext.Provider" (@​kassens #33507)
• Include stack of cause of React instrumentation errors with %o placeholder (@​eps1lon #34198)
• Fix infinite useDeferredValue loop in popstate event (@​acdlite #32821)
• Fix a bug when an initial value was passed to useDeferredValue (@​acdlite #34376)
• Fix a crash when submitting forms with Client Actions (@​sebmarkbage #33055)
• Hide/unhide the content of dehydrated suspense boundaries if they resuspend (@​sebmarkbage #32900)
• Avoid stack overflow on wide trees during Hot Reload (@​sophiebits #34145)
• Improve Owner and Component stacks in various places (@​sebmarkbage, @​eps1lon: #33629, #33724, #32735, #33723)
• Add cacheSignal (@​sebmarkbage #33557)

React DOM

• Block on Suspensey Fonts during reveal of server-side-rendered content (@​sebmarkbage #33342)
• Use underscore instead of : for IDs generated by useId (@​sebmarkbage, @​eps1lon: #32001, facebook/react#33342#33099, #33422)
• Stop warning when ARIA 1.3 attributes are used (@​Abdul-Omira #34264)
• Allow nonce to be used on hoistable styles (@​Andarist #32461)
• Warn for using a React owned node as a Container if it also has text content (@​sebmarkbage #32774)

... (truncated)

Changelog

Sourced from react's changelog.

19.2.0 (October 1st, 2025)

Below is a list of all new features, APIs, and bug fixes.

Read the React 19.2 release post for more information.

New React Features

• <Activity>: A new API to hide and restore the UI and internal state of its children.
• useEffectEvent is a React Hook that lets you extract non-reactive logic into an Effect Event.
• cacheSignal (for RSCs) lets your know when the cache() lifetime is over.
• React Performance tracks appear on the Performance panel’s timeline in your browser developer tools

New React DOM Features

• Added resume APIs for partial pre-rendering with Web Streams:
  • resume: to resume a prerender to a stream.
  • resumeAndPrerender: to resume a prerender to HTML.
• Added resume APIs for partial pre-rendering with Node Streams:
  • resumeToPipeableStream: to resume a prerender to a stream.
  • resumeAndPrerenderToNodeStream: to resume a prerender to HTML.
• Updated prerender APIs to return a postponed state that can be passed to the resume APIs.

Notable changes

• React DOM now batches suspense boundary reveals, matching the behavior of client side rendering. This change is especially noticeable when animating the reveal of Suspense boundaries e.g. with the upcoming <ViewTransition> Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics.
• Add Node Web Streams (prerender, renderToReadableStream) to server-side-rendering APIs for Node.js
• Use underscore instead of : IDs generated by useId

All Changes

React

• <Activity /> was developed over many years, starting before ClassComponent.setState (@​acdlite @​sebmarkbage and many others)
• Stringify context as "SomeContext" instead of "SomeContext.Provider" (@​kassens #33507)
• Include stack of cause of React instrumentation errors with %o placeholder (@​eps1lon #34198)
• Fix infinite useDeferredValue loop in popstate event (@​acdlite #32821)
• Fix a bug when an initial value was passed to useDeferredValue (@​acdlite #34376)
• Fix a crash when submitting forms with Client Actions (@​sebmarkbage #33055)
• Hide/unhide the content of dehydrated suspense boundaries if they resuspend (@​sebmarkbage #32900)
• Avoid stack overflow on wide trees during Hot Reload (@​sophiebits #34145)
• Improve Owner and Component stacks in various places (@​sebmarkbage, @​eps1lon: #33629, #33724, #32735, #33723)
• Add cacheSignal (@​sebmarkbage #33557)

React DOM

• Block on Suspensey Fonts during reveal of server-side-rendered content (@​sebmarkbage #33342)
• Use underscore instead of : for IDs generated by useId (@​sebmarkbage, @​eps1lon: #32001, facebook/react#33342#33099, #33422)
• Stop warning when ARIA 1.3 attributes are used (@​Abdul-Omira #34264)
• Allow nonce to be used on hoistable styles (@​Andarist #32461)

... (truncated)

Commits

• 5667a41 Bump next prerelease version numbers (#34639)
• 8bb7241 Bump useEffectEvent to Canary (#34610)
• e3c9656 Ensure Performance Track are Clamped and Don't overlap (#34509)
• 68f00c9 Release Activity in Canary (#34374)
• 0e10ee9 [Reconciler] Set ProfileMode for Host Root Fiber by default in dev (#34432)
• 3bf8ab4 Add missing Activity export to development mode (#34439)
• 1549bda [Flight] Only assign _store in dev mode when creating lazy types (#34354)
• bb6f0c8 [Flight] Fix wrong missing key warning when static child is blocked (#34350)
• 05addfc Update Flow to 0.266 (#34271)
• ec5dd0a Update Flow to 0.257 (#34253)
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Coverage variation	Diff coverage
✅ +0.00%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3a696b0)	959	931	97.08%
Head commit (d0ceab7)	959 (+0)	931 (+0)	97.08% (+0.00%)

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Pull request (#706)	0	0	∅ (not applicable)

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