Fix : Menu shouldn't be displayed on logged out pages (#11437)

#11414 
Conditionally render MobileNavigationBar based on user authentication
status
- Added useIsLogged hook to check if the user is authenticated.
- Updated MobileNavigationBar component to render only when the user is
logged in.
![Screenshot from 2025-04-08
12-33-04](https://github.com/user-attachments/assets/1b58a5ac-e5ff-418f-a903-b952f37db84d)

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/ui/layout/page/components/DefaultLayout.tsx

@@ -122,7 +122,7 @@ export const DefaultLayout = () => {
               </StyledMainContainer>
             )}
           </StyledPageContainer>
-          {isMobile && <MobileNavigationBar />}
+          {isMobile && !showAuthModal && <MobileNavigationBar />}
         </AppErrorBoundary>
       </StyledLayout>
     </>