refactor(gallery): add attachment_gallery_item component

app/components/attachment/gallery_item_component.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Attachment::GalleryItemComponent < ApplicationComponent
+  include GalleryHelper
+  attr_reader :attachment
+
+  def initialize(attachment:)
+    @attachment = attachment
+  end
+
+  def blob
+    attachment.blob
+  end
+
+  def libelle
+    attachment.record.class.in?([Champs::PieceJustificativeChamp, Champs::TitreIdentiteChamp]) ? attachment.record.libelle : 'Pièce jointe au message'
+  end
+
+  def title
+    "#{libelle} -- #{sanitize(blob.filename.to_s)}"
+  end
+end