fix(editor): make horizontal-rule draggable

[Darmody]

fix #280

[github-actions]

This pull request has been built and is available for preview at pr445.mashcard.dev.
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[codecov]

Codecov Report

Merging #445 (6681cbe) into main (b0e22b2) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #445      +/-   ##
==========================================
- Coverage   69.70%   69.69%   -0.01%     
==========================================
  Files        1060     1060              
  Lines       18018    18019       +1     
  Branches     2492     2493       +1     
==========================================
  Hits        12559    12559              
- Misses       5146     5147       +1     
  Partials      313      313              

Flag	Coverage Δ
frontend-unit	65.35% <ø> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...extensions/blocks/horizontalRule/horizontalRule.ts	81.81% <ø> (ø)
...r/src/extensions/extensions/selection/domEvents.ts	77.89% <0.00%> (-0.83%)	⬇️

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