chore: [app-router-migration 26] Migrate "/[user]" page

[hbjORbj]

What does this PR do?

• This PR migrates the /[user] page to the app directory (which runs under the App Router).
• The migrated page exists under /future and is accessible at all times.

Requirement/Documentation

• If there is a requirement document, please, share it here.
• If there is ab UI/UX design document, please, share it here.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Chore (refactoring code, technical debt, workflow improvements)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Tests (Unit/Integration/E2E or any other test)
• [ ] This change requires a documentation update

How should this be tested?

• Are there environment variables that should be set?
• What are the minimal test data to have?
• What is expected (happy path) to have (input and output)?
• Any other important info that could help to test that PR

Mandatory Tasks

• [ ] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't commented my code, particularly in hard-to-understand areas
• I haven't checked if my PR needs changes to the documentation
• I haven't checked if my changes generate no new warnings
• I haven't added tests that prove my fix is effective or that my feature works
• I haven't checked if new and existing unit tests pass locally with my changes

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This PR introduced no changes to the JavaScript bundle! 🙌

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[hbjORbj]

@zomars I tried a bunch of things, but the test you mentioned still fails... Hmm... do you have any clue?