chore: enhance tab focus flow, skip file explorer container

src/components/FileExplorer/index.tsx

@@ -194,6 +194,7 @@ function LoadedFileExplorer({
           // instead of unmounting, hide the element when not needed, so that the ref can be preserved after search result matches nothing
           hidden: visibleNodes.nodes.length === 0,
         })}
+        tabIndex={-1} // prevent getting focus via tab key on GitHub
         ref={filesRef}
       >
         <div