feat(use-cases): add reusable bottom bar baseline

[TheoGrandin74]

Summary

Issue:

Screenshots / Recordings

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (new-navigation@556c611). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             new-navigation    #2527   +/-   ##
=================================================
  Coverage                  ?   44.28%           
=================================================
  Files                     ?     1060           
  Lines                     ?    21614           
  Branches                  ?     6307           
=================================================
  Hits                      ?     9572           
  Misses                    ?    10311           
  Partials                  ?     1731           

Flag	Coverage Δ
unittests	44.28% <100.00%> (?)

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