style(demande): fix highlighted background updated at champ

app/assets/stylesheets/02_utils.scss

@@ -136,8 +136,9 @@
 
 // who known
 .highlighted {
-  background: $orange-bg;
-  color: $black;
+  background-color: var(--background-contrast-yellow-moutarde); // from fr-badge--new
+  color: var(--text-action-high-grey);
+  background-clip: content-box;
 }
 
 .overflow-y-visible {

app/components/dossiers/champ_row_show_component/champ_row_show_component.html.haml

@@ -8,10 +8,12 @@
     - else
       .flex.d-block-sm
         %p.champ-label.flex-grow= "#{champ.libelle} :"
-        %p.fr-mb-0.fr-text--sm
+
         - if updated_after_deposer?(champ)
+          %p.fr-mb-0.fr-text--sm
             %span{ class: highlight_if_unseen_class(@demande_seen_at, champ.updated_at) }
               = t(:updated_at, scope: [:views, :shared, :dossiers, :form], datetime: try_format_datetime(champ.updated_at))
+
       - if champ.blank? && ![TypeDeChamp.type_champs.fetch(:piece_justificative), TypeDeChamp.type_champs.fetch(:titre_identite)].include?(champ.type_champ)
         .champ-content.fr-text-mention--grey{ class: [highlight_if_unseen_class(@demande_seen_at, champ.updated_at), champ.type_champ] }
           %p= t('.blank')
@@ -59,4 +61,5 @@
           - when TypeDeChamp.type_champs.fetch(:number)
             %p= number_with_html_delimiter(champ.to_s)
           - else
-            %p= format_text_value(champ.to_s.strip) unless champ.blank?
+            - if champ.present?
+              = format_text_value(champ.to_s.strip) # format already wrap in p