tech(refactor): much nicer code, thx LeSim

root -> rooted_tree

depth_cach -> walk

smal refactor

comment

remove form for header_section

remove seen_at from header section

header_section: champ -> header_section

champ_subree: remove if not

remove root_depth use header_section_level_value instead

remove unused include

remove ChampTreeComponent

rename ChampsSubtreeComponent to SectionComponent

use TreeableConcern only in section component

remove fields_for_champ_component

champs -> tail

add split_section_champ helper

refactor(editable_champ::header_section): keep same interface everywhere

fix(repetition): add spec for SectionComponent on repetitions

app/views/shared/dossiers/_edit.html.haml

@@ -42,5 +42,5 @@
         = f.select :groupe_instructeur_id,
           dossier.procedure.groupe_instructeurs.active.map { |gi| [gi.label, gi.id] },
           { include_blank: dossier.brouillon? }
-    = render EditableChamp::ChampsTreeComponent.new(champs: dossier.champs_public, root_depth: 0)
+    = render EditableChamp::SectionComponent.new(champs: dossier.champs_public)
   = render Dossiers::EditFooterComponent.new(dossier: dossier, annotation: false)

app/views/shared/dossiers/_edit_annotations.html.haml

@@ -3,7 +3,7 @@
     %section.counter-start-header-section
       = render NestedForms::FormOwnerComponent.new
       = form_for dossier, url: annotations_instructeur_dossier_path(dossier.procedure, dossier), html: { class: 'form', multipart: true } do |f|
-        = render EditableChamp::ChampsTreeComponent.new(champs: dossier.champs_private, root_depth: 0)
+        = render EditableChamp::SectionComponent.new(champs: dossier.champs_private)
 
       = render Dossiers::EditFooterComponent.new(dossier: dossier, annotation: true)
   - else