[stable5.0] fix(attachments): improve layout

[backportbot]

Backport of PR #6274

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 15.45%. Comparing base (ce780fb) to head (9f2c9e9).
Report is 3 commits behind head on stable5.0.

Files	Patch %	Lines
.../components/Editor/Attachments/AttachmentsList.vue	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           stable5.0    #6276   +/-   ##
==========================================
  Coverage      15.45%   15.45%           
==========================================
  Files            205      205           
  Lines           9426     9426           
  Branches        2188     2199   +11     
==========================================
  Hits            1457     1457           
  Misses          7654     7654           
  Partials         315      315           

Flag	Coverage Δ
javascript	15.45% <0.00%> (ø)

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