feat: enable image capture and download of graph

[seve]

#393

Adds image downloading button

Feature flag: ?dl=true

Also adds some QOL's for local dev and testing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.57%. Comparing base (df7d42d) to head (25cd8ac).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #817   +/-   ##
=======================================
  Coverage   76.57%   76.57%           
=======================================
  Files          88       88           
  Lines        6994     6994           
=======================================
  Hits         5356     5356           
  Misses       1638     1638           

Flag	Coverage Δ
frontend	76.57% <ø> (ø)
javascript	76.57% <ø> (ø)
unitTest	76.57% <ø> (ø)

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[kaloster]

This looks good to me! 🚀

More of a product thing but maybe we should add some branding to the downloaded image

[seve]

More of a product thing but maybe we should add some branding to the downloaded image

Oh god please no