build(deps): bump react and @types/react in /web

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) and [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react). These dependencies needed to be updated together.

Updates `react` from 18.3.1 to 19.0.0
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.0.0/packages/react)

Updates `@types/react` from 18.3.12 to 19.0.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react)

---
updated-dependencies:
- dependency-name: react
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/react"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

web/packages/demo/package.json

@@ -13,12 +13,12 @@
         "checkTypes": "tsc --noemit"
     },
     "dependencies": {
-        "react": "^18.3.1",
+        "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "ruffle-core": "^0.1.0"
     },
     "devDependencies": {
-        "@types/react": "^18.3.12",
+        "@types/react": "^19.0.1",
         "@types/react-dom": "^19.0.1",
         "@vitejs/plugin-react": "^4.3.4",
         "typescript": "^5.7.2",

web/packages/demo/src/navbar/samples.tsx

@@ -25,7 +25,7 @@ export interface DemoSwf {
 }
 
 interface SampleSelectionProperties {
-    sampleSelectionInput: RefObject<HTMLSelectElement>;
+    sampleSelectionInput: RefObject<HTMLSelectElement | null>;
     selectedSample: DemoSwf | null;
     setSelectedSample: (value: DemoSwf | null) => void;
     setSelectedFilename: (name: string | null) => void;

web/packages/demo/src/player.tsx

@@ -13,7 +13,7 @@ export interface PlayerAttributes {
 }
 
 export class Player extends React.Component<PlayerAttributes> {
-    private readonly container: React.RefObject<HTMLDivElement>;
+    private readonly container: React.RefObject<HTMLDivElement | null>;
     private player: RufflePlayer.PlayerElement | null = null;
 
     // [NA] Ruffle has a bug where if you load a swf whilst it's already loading another swf, it breaks