[Nice To Have] Practice calendar show days in green when target was reached

[riccardol]

It would be nice to have the Practice Calendar in the Profile section show days in which the target was reached in green.

I think this could be based on the currently active daily target, but maybe in the future it would be (??maybe??) better to make it relate to the target active back at that day (except for before the target was implemented? :D)