feat: ViewTransitionWrapper shared component with stable react-dom fallback

Wraps children in React's ViewTransition (canary API) when available,
falling back to Fragment in environments where ViewTransition is undefined
(test env, stable react-dom). Add react/canary to tsconfig types to
expose the ViewTransition component type.

src/shared/ui/index.ts

@@ -10,3 +10,4 @@ export { RichText } from './RichText';
 export type { ContainerSize, SectionBackground } from './Section';
 export { Container, Section } from './Section';
 export { TechStackBrick, TechStackGrid } from './TechStack';
+export { ViewTransitionWrapper } from './ViewTransitionWrapper';