fix(appv2): correction sauvegarde champs description HTML

- Remplacer les balises <prose-mirror> brutes par {{formInput}}
  pour les champs HTMLField (biographie, notes, description)
- Onglets passent en basculement CSS sans re-render
- Ajout de systemFields au contexte des feuilles d'acteur

module/applications/sheets/base-actor-sheet.mjs

@@ -49,6 +49,7 @@ export default class BoLBaseActorSheet extends HandlebarsApplicationMixin(foundr
     return {
       actor,
       system: actor.system,
+      systemFields: actor.system.schema.fields,
       config: game.bol.config,
       isGM: game.user.isGM,
       isEditable: this.isEditable,
@@ -112,7 +113,8 @@ export default class BoLBaseActorSheet extends HandlebarsApplicationMixin(foundr
       link.addEventListener("click", (event) => {
         event.preventDefault()
         this.tabGroups[group] = tab
-        this.render()
+        nav.querySelectorAll("[data-tab]").forEach(l => l.classList.toggle("active", l.dataset.tab === tab))
+        this.element.querySelectorAll(`[data-group="${group}"][data-tab]`).forEach(c => c.classList.toggle("active", c.dataset.tab === tab))
       })
     })