fix: importer foundry.applications.api et utiliser _onRender dans les pickers AppV2

- applications.mjs: import HandlebarsApplicationMixin/ApplicationV2 from
  foundry.applications.api (they are not globals in Foundry v14), fixing
  'ReferenceError: HandlebarsApplicationMixin is not defined'
- Replace activateListeners(html) with _onRender(context, options) and
  this.element — AppV2 does not call activateListeners
- TraitSelector: remove recursive render(true) in _validateTraits
- fight.mjs: VermineCombatTracker same _onRender conversion

module/system/applications.mjs

@@ -1,3 +1,5 @@
+const { HandlebarsApplicationMixin, ApplicationV2 } = foundry.applications.api
+
 export class TotemPicker extends HandlebarsApplicationMixin(ApplicationV2) {
 
   constructor(linkEl, actor) {
@@ -24,9 +26,9 @@ export class TotemPicker extends HandlebarsApplicationMixin(ApplicationV2) {
     return { config: CONFIG.VERMINE };
   }
 
-  activateListeners(html) {
-    super.activateListeners(html);
-    html.querySelectorAll('.totem').forEach(el => {
+  _onRender(context, options) {
+    super._onRender(context, options);
+    this.element.querySelectorAll('.totem').forEach(el => {
       el.addEventListener('click', event => {
         const link = event.target.closest('a');
         if (!link?.dataset.totem) return;
@@ -80,9 +82,9 @@ export class ActorPicker extends HandlebarsApplicationMixin(ApplicationV2) {
     };
   }
 
-  activateListeners(html) {
-    super.activateListeners(html);
-    html.querySelectorAll('.actor').forEach(el => {
+  _onRender(context, options) {
+    super._onRender(context, options);
+    this.element.querySelectorAll('.actor').forEach(el => {
       el.addEventListener('click', async event => {
         const div = event.target.closest('div');
         const actorId = div?.dataset.actorId;
@@ -148,15 +150,15 @@ export class TraitSelector extends HandlebarsApplicationMixin(ApplicationV2) {
     };
   }
 
-  activateListeners(html) {
-    super.activateListeners(html);
-    this._validateTraits(html);
-    html.querySelectorAll('input').forEach(el => {
+  _onRender(context, options) {
+    super._onRender(context, options);
+    this._validateTraits(this.element);
+    this.element.querySelectorAll('input').forEach(el => {
       el.addEventListener('change', ev => this._onChangeInput(ev));
     });
   }
 
-  async _validateTraits(html) {
+  _validateTraits(html) {
     const checks = html.querySelectorAll("input.trait-selector");
     for (const inp of checks) {
       if (this.targetItem.system.traits[inp.dataset.trait]) {
@@ -165,7 +167,6 @@ export class TraitSelector extends HandlebarsApplicationMixin(ApplicationV2) {
         }
       }
     }
-    await this.render(true);
   }
 
   async _onChangeInput(ev) {