[demo] Add missing viz dep for demo

[felixT2K]

This PR:

• Fix missing demo dependencies

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.51%. Comparing base (2f9f50e) to head (8244057).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1751      +/-   ##
==========================================
+ Coverage   96.49%   96.51%   +0.01%     
==========================================
  Files         164      164              
  Lines        7881     7881              
==========================================
+ Hits         7605     7606       +1     
+ Misses        276      275       -1     

Flag	Coverage Δ
unittests	96.51% <ø> (+0.01%)	⬆️

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