feat(header): add user-menu

[RemiBonnet]

Summary

• Add user-menu in the header

https://qovery.slack.com/archives/C0A3EJJ1YAX/p1767889279004259

Testing

• Changes tested locally in the relevant Console's pages and Storybooks
• yarn test or yarn test -u (if you need to regenerate snapshots)
• yarn format
• yarn lint

PR Checklist

• I followed naming, styling, and TypeScript rules (see .cursor/rules)
• I performed a self-review (diff inspected, dead code removed)
• I titled the PR using Conventional Commits with a scope when possible (e.g. feat(service): add new Terraform service) - required for semantic-release
• I only kept necessary comments, written in English (watch for useless AI comments)
• I involved a designer to validate UI changes if I am not a designer
• I covered new business logic with tests (unit)
• I confirmed CI is green (Codecov red can be accepted)
• I reviewed and executed locally any AI-assisted code

[RemiBonnet]

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Command	Blueprint environment
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This comment has been generated from Qovery AI 🤖.
Below, a word from its wisdom :

You are going to thank you later if it contains tests

[rmnbrd]

Awesome!