Fix position of assistant button

[JuliaKirschenheuter]

📝 Summary

• Resolves: Assistant action menu has a wrong position #6768

🖼️ Screenshots

🏚️ Before | 🏡 After

Before	After

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.89%. Comparing base (679e48f) to head (8fbd244).
Report is 81 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7031      +/-   ##
==========================================
- Coverage   51.89%   51.89%   -0.01%     
==========================================
  Files         478      478              
  Lines       40634    40628       -6     
  Branches      990      990              
==========================================
- Hits        21088    21082       -6     
  Misses      19440    19440              
  Partials      106      106              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.