fix: add user icon on nav bar

[marco-digennaro]

Add user icon on the navbar when user is not logged in

closes #5179

Backend checklist

• [ ] Formatted my code by running ruff check --select I --fix . && ruff check . && ruff format . in app/backend
• [ ] Added tests for any new code or added a regression test if fixing a bug
• [ ] All tests pass
• [ ] Run the backend locally and it works
• [ ] Added migrations if there are any database changes, rebased onto develop if necessary for linear migration history

Web frontend checklist

• [x ] Formatted my code with yarn format
• [ x] There are no warnings from yarn lint --fix
• [ x] There are no console warnings when running the app
• [ ] Added any new components to storybook
• [ ] Added tests where relevant
• [ ] All tests pass
• [ x] Clicked around my changes running locally and it works
• [ x] Checked Desktop, Mobile and Tablet screen sizes

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[bakeiro]

awesome! :D