Fix broken clip page navigation

[victorges]

Fix navigation throttling by removing navigate from useUser hook dependencies and adding a navigation guard.

The navigate function from react-router-dom was incorrectly included in the useEffect dependency array within useUser.ts. This caused the effect to re-run on every render, leading to a rapid navigation loop when combined with auth state changes that could trigger navigate('/login'). The browser detected this as throttling, preventing successful navigation to the clip page. The hasNavigated flag further ensures navigate('/login') is called only once per effect lifecycle.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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