> I know my photographic rights

Taking the photos was probably not illegal.

Citizen’s arrest in California is legal for a misdemeanor (e.g., shoplifting as in your case) only when the arrestee is both factually guilty and committed the crime in the arresting person’s presence; whether or not the first part is true, by your description the second is not and you committed both battery and false imprisonment, possibly felony (by violence or menace) in the latter case.