fix(files): switch action button to disabled state if results are empty

[JuliaKirschenheuter]

📝 Summary

• Resolves: part of Design review issues 2024-07-30 #6152
  Assistant bugs: Show assistant results does not have any results shown (emptycontent)

🖼️ Screenshots

🏚️ 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 46.78%. Comparing base (8586891) to head (662e2c1).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6799      +/-   ##
==========================================
+ Coverage   46.76%   46.78%   +0.01%     
==========================================
  Files         748      740       -8     
  Lines       34162    34150      -12     
  Branches     1242     1234       -8     
==========================================
  Hits        15976    15976              
+ Misses      17564    17560       -4     
+ Partials      622      614       -8     

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[max-nextcloud]

I did not test it but the change makes sense.