Apply grab and grabbing cursor to graph UI element

[talohana]

Resolves #837

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.92%. Comparing base (0ed6a68) to head (dee7a57). Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #854      +/-   ##
==========================================
+ Coverage   66.86%   66.92%   +0.05%     
==========================================
  Files          44       44              
  Lines        9824     9793      -31     
==========================================
- Hits         6569     6554      -15     
+ Misses       2794     2784      -10     
+ Partials      461      455       -6     

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