feat(frontend): Onboarding flow UI

[kcze]

Changes 🏗️

This PR adds interactive UI for the onboarding flow, without any connection to the backend.
Visit /onboarding to see it!

• Add Onboarding pages to app/onboarding/
• Add Onboarding components to components/onboarding

Note:

• Backend isn't connected, so the agents won't run and state isn't preserved
• Onboarding state is lost on refresh

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • ...

[deepsource-io]

Here's the code health analysis summary for commits e550846..0a0971d. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success	❗ 30 occurences introduced 🎯 1 occurence resolved	View Check ↗
Python	✅ Success		View Check ↗

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[majdyz]

How do I test this change? Can you provide some videos/screenshots of the feature?

[majdyz]

Kindly retag me when you've updated the PR description.

[majdyz]

Screen.Recording.2025-02-20.at.6.00.06.PM.mov

I'm still unable to proceed from here, clicking the button does nothing (no error logs on the client and server either).