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.

tsconfig.json

@@ -18,7 +18,7 @@
         "name": "next"
       }
     ],
-    "types": ["vitest/globals"],
+    "types": ["vitest/globals", "react/canary"],
     "paths": {
       "@/*": ["./*"],
       "$shared/*": ["./src/shared/*"],