build(deps): upgrade TypeScript from 5.x to 6.x

TypeScript 6 now includes Navigation API types, so the
@ts-expect-error directive in Router.tsx is no longer needed.
Also added optional chaining for `navigation.transition` which
can be null.

https://claude.ai/code/session_019Ds1gqBPnpo5cDw6Fqzmw5

Author: claude

packages/docs/src/Router.tsx

@@ -7,7 +7,6 @@ export const Router: React.FC<RouterProps> = (props) => {
   // Auto scroll to top - this should be handled by the browser per spec,
   // but currently Chrome and Safari do not follow the spec.
   useEffect(() => {
-    // @ts-expect-error -- TypeScript does not yet know about the Navigation API
     const navigation = window.navigation;
     if (!navigation) {
       return;
@@ -18,8 +17,8 @@ export const Router: React.FC<RouterProps> = (props) => {
       () => {
         const transition = navigation.transition;
         if (
-          transition.navigationType === "push" ||
-          transition.navigationType === "replace"
+          transition?.navigationType === "push" ||
+          transition?.navigationType === "replace"
         ) {
           // Safari is known to ignore scrolling immediately after a push/replace navigation, so we wait a bit
           // Also, Safari doesn't handle scrolling to 0, so we use the -1 trick

pnpm-lock.yaml

@@ -9,7 +9,7 @@ catalog:
   "@vitejs/plugin-react": ^6.0.1
   react: ^19.2.4
   react-dom: ^19.2.4
-  typescript: ^5.9.3
+  typescript: ^6.0.2
   vite: ^8.0.3
 
 onlyBuiltDependencies: