feat: canvas search (#8438)

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

excalidraw-app/components/AppMainMenu.tsx

@@ -31,6 +31,7 @@ export const AppMainMenu: React.FC<{
         />
       )}
       <MainMenu.DefaultItems.CommandPalette className="highlighted" />
+      <MainMenu.DefaultItems.SearchMenu />
       <MainMenu.DefaultItems.Help />
       <MainMenu.DefaultItems.ClearCanvas />
       <MainMenu.Separator />