Update react monorepo to v19 (major) (#28914)

* Update react monorepo to v19

* Import JSX explicitly for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update react imports

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* Avoid legacy contexts as much as possible

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* Avoid deprecated React symbols

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* Stash

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* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

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* Iterate

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* Switch pillify to use a html-react-parser approach rather than DOM muddling

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* Iterate

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* Iterate react html parsing

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* Iterate react html parsing

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* Iterate html parsing

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* Memoize the EventContentBody component

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* Iterate html parsing

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* Iterate

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* Iterate

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* Simplify

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* Iterate

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* Discard changes to src/Linkify.tsx

* Discard changes to src/components/views/messages/TextualBody.tsx

* Discard changes to src/settings/handlers/AbstractLocalStorageSettingsHandler.ts

* Iterate

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* Iterate

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* Iterate

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* Iterate

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* Iterate

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* Prepare for React 19 upgrade

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* Iterate

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* Remove stale comment

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---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

patches/react-blurhash+0.3.0.patch

@@ -0,0 +1,22 @@
+diff --git a/node_modules/react-blurhash/dist/index.d.ts b/node_modules/react-blurhash/dist/index.d.ts
+index 3adbd0a..32e8c13 100644
+--- a/node_modules/react-blurhash/dist/index.d.ts
++++ b/node_modules/react-blurhash/dist/index.d.ts
+@@ -19,7 +19,7 @@ declare class Blurhash extends React.PureComponent<Props$1> {
+         resolutionY: number;
+     };
+     componentDidUpdate(): void;
+-    render(): JSX.Element;
++    render(): React.JSX.Element;
+ }
+ 
+ declare type Props = React.CanvasHTMLAttributes<HTMLCanvasElement> & {
+@@ -37,7 +37,7 @@ declare class BlurhashCanvas extends React.PureComponent<Props> {
+     componentDidUpdate(): void;
+     handleRef: (canvas: HTMLCanvasElement) => void;
+     draw: () => void;
+-    render(): JSX.Element;
++    render(): React.JSX.Element;
+ }
+ 
+ export { Blurhash, BlurhashCanvas };