docs: update browser support to include Safari 26.2

Safari 26.2 now supports the Navigation API. Update browser support
documentation in README.md and GettingStartedPage.tsx to reflect this.

Author: claude

README.md

@@ -225,9 +225,10 @@ The Navigation API is supported in:
 
 - Chrome 102+
 - Edge 102+
+- Safari 26.2+
 - Opera 88+
 
-Firefox and Safari do not yet support the Navigation API. For these browsers, consider using a polyfill.
+Firefox does not yet support the Navigation API. For Firefox, consider using a polyfill.
 
 ## License
 

packages/docs/src/pages/GettingStartedPage.tsx

@@ -26,8 +26,9 @@ yarn add @funstack/router`}</code>
           >
             Navigation API
           </a>{" "}
-          which is currently supported in Chromium-based browsers. For broader
-          browser support, consider using a polyfill.
+          which is supported in Chrome 102+, Edge 102+, Safari 26.2+, and Opera
+          88+. Firefox does not yet support the Navigation API; for Firefox,
+          consider using a polyfill.
         </p>
       </section>