tech(refacto): extrait la logique de rendu du dsfr sur les composants

app/models/champs/checkbox_champ.rb

@@ -1,8 +1,4 @@
 class Champs::CheckboxChamp < Champs::BooleanChamp
-  def dsfr_champ_container
-    :fieldset
-  end
-
   def for_export
     true? ? 'on' : 'off'
   end
@@ -15,6 +11,11 @@ class Champs::CheckboxChamp < Champs::BooleanChamp
     false
   end
 
+  # TODO remove when normalize_checkbox_values is over
+  def true?
+    value_with_legacy == TRUE_VALUE
+  end
+
   def html_label?
     false
   end
@@ -22,4 +23,11 @@ class Champs::CheckboxChamp < Champs::BooleanChamp
   def single_checkbox?
     true
   end
+
+  private
+
+  # TODO remove when normalize_checkbox_values is over
+  def value_with_legacy
+    value == 'on' ? TRUE_VALUE : value
+  end
 end