[Feature]: Add support for React 19

[aldenquimby]

What's the feature?

React 19 is the latest stable major version. Quick starting new projects with React, Next.js, etc will give you React 19.

It would be nice if @100mslive/roomkit-react allowed using React 19, so that folks aren't forced to downgrade a major version to use 100ms.live

Related: #3131

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[raviteja83]

@aldenquimby are you facing any specific issues while using with React19 other than the peer dependecy errror?

[aldenquimby]

@raviteja83 the only bug I've found so far is that virtual backgrounds do not work. The pane renders fine, but clicking a background does nothing, and this error is reported:

There are lots of runtime errors in the console, but they don't appear to cause any actual problems. For example on loading PreviewScreen:

Various other screens (e.g. settings modal from within conference screen) report the same ref runtime error, but appear to work fine.

From the conference screen participant list side panel, I see this runtime error, although all appears to work fine:

(I did not test the whiteboard feature, because I haven't gotten that working with React 18 yet in Next.js)