fix(accept-invitation): enhance UI and fix redirect issues

[RemiBonnet]

Summary

Fix redirect issues with invitation members flow + improve UI

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

❌ Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.14%. Comparing base (ed785f4) to head (f1a1316).
⚠️ Report is 1 commits behind head on new-navigation.

Files with missing lines	Patch %	Lines
.../lib/hooks/use-invite-member/use-invite-member.tsx	89.18%	4 Missing ⚠️
...re/src/lib/accept-invitation/accept-invitation.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           new-navigation    #2584      +/-   ##
==================================================
+ Coverage           45.28%   54.14%   +8.85%     
==================================================
  Files                1119       12    -1107     
  Lines               22820      314   -22506     
  Branches             6666       75    -6591     
==================================================
- Hits                10333      170   -10163     
+ Misses              10623      124   -10499     
+ Partials             1864       20    -1844     

Flag	Coverage Δ
unittests	54.14% <87.17%> (+8.85%)	⬆️

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[rmnbrd]

Looks good to me