fix(onboarding): require a use case selection so onboarding.use_cases is never empty

[jul-dan]

Summary

Issue: QOV-2195

• Some orgs never populated onboarding.use_cases because the "Continue" button on the use-cases step could be clicked with nothing selected, permanently hiding the "Getting started" checklist on the org overview for every member.
• Made use case selection mandatory (disable "Continue" until at least one is picked).
• Replaced rde and spec-to-prod use cases with a new migrate-to-qovery one.
• Switched the cards layout to flex flex-wrap justify-center so an incomplete last row stays centered.

Screenshots / Recordings

Before	After

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

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Summary by cubic

Requires onboarding users to select at least one use case before continuing, fixing QOV-2195 so the getting-started checklist is no longer permanently hidden by an empty selection.

• Replaces the rde and spec-to-prod options with a "Migrate to another cloud provider from Heroku, Render or another PaaS" use case.
• Centers the use case cards when the last row is incomplete.
• The Continue button is disabled until at least one use case is selected.

^{Written for commit 62b3790. Summary will update on new commits.}

[nx-cloud]

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Command	Status	Duration	Result
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nx affected --target=test --parallel=3 --config...	✅ Succeeded	18s	View ↗
nx affected --target=lint --parallel=3	✅ Succeeded	2m 24s	View ↗
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☁️ Nx Cloud last updated this comment at 2026-08-27 09:08:32 UTC

[cubic-dev-ai]

All reported issues were addressed across 1 file

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 54.12%. Comparing base (eaaeba1) to head (62b3790).

Files with missing lines	Patch %	Lines
.../feature/src/lib/step-use-cases/step-use-cases.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2908      +/-   ##
===========================================
+ Coverage    48.46%   54.12%   +5.65%     
===========================================
  Files         1272       13    -1259     
  Lines        27590      303   -27287     
  Branches      8114       64    -8050     
===========================================
- Hits         13372      164   -13208     
+ Misses       11952      128   -11824     
+ Partials      2266       11    -2255     

Flag	Coverage Δ
unittests	54.12% <0.00%> (+5.65%)	⬆️

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[RemiBonnet]

🎉 This PR is included in version 1.344.0 🎉

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