feat(champ siret): improve default base SIRET column wording

app/models/types_de_champ/type_de_champ_base.rb

@@ -116,8 +116,13 @@ class TypesDeChamp::TypeDeChampBase
   private
 
   def libelle_with_prefix(prefix)
+    # SIRET needs to be explicit in listings for better UI readability
+    if type_champ == "siret" && !libelle.upcase.include?("SIRET")
+      [prefix, libelle, "SIRET"].compact.join(' – ')
+    else
       [prefix, libelle].compact.join(' – ')
     end
+  end
 
   def paths
     [

spec/models/types_de_champ/siret_type_de_champ_spec.rb

@@ -7,6 +7,16 @@ describe TypesDeChamp::SiretTypeDeChamp do
   describe "#columns" do
     subject(:columns) { tdc_siret.columns(procedure: procedure) }
 
+    it "returns base column without duplicating SIRET when already in libelle" do
+      expect(columns[0].label).to eq("Numéro SIRET")
+    end
+
+    it "returns base column with SIRET when libelle doesn't contain SIRET" do
+      tdc_siret.update(libelle: "Identification de l'entreprise")
+
+      expect(columns[0].label).to eq("Identification de l'entreprise – SIRET")
+    end
+
     it "includes required jsonpaths" do
       expected_paths = [
         "$.entreprise_raison_sociale",