Update root component to React functional component.

Description:

The root component is currently implemented as a React class component. It should be updated to use a more modern functional component for consistency and to leverage hooks.
currently it looks like this

export default class Root extends React.Component<{}, IState> {
	private listenerTimeout!: any;
	private dimensionsListener?: EmitterSubscription

	constructor(props: any) {
		super(props);
		this.init();
		if (!isFDroidBuild) {
			this.initCrashReport();
		}
		const { width, height, scale, fontScale } = Dimensions.get('window');
		const theme = initialTheme();
		this.state = {
			theme: getTheme(theme),
			themePreferences: theme,
			width,
			height,
			scale,
			fontScale
		};
		if (isTablet) {
			this.initTablet();
		}
		setNativeTheme(theme);
	}

Additional context:

In the future, all components using class components should migrate to functional components to align with modern React practices.

Locate the root component implementation in the repository and review its initialization, lifecycle behavior, dimensions handling, theme setup, tablet setup, and crash reporting. Convert it to a functional component while preserving the current startup behavior and verify the mobile application still builds and runs on its supported platforms.