I will have some free cycles over the next couple weeks that I could devote to implementing this; but since I was not able to attend the relevant discussions last week I wanted to check in and see if the situation has changed since creating that issue.
Discussed if next major version should remain 5 or be updated to 6
Next release will likely be 5.8 and will switch to 6.0 after we finalize the integration of new theme (and most likely transition to Qt6)
Theme
If extension developers provide only one version of the icon (light or dark, svg or png, we will look into adding automatic conversion (aka recoloring)