Fix: Replace missing effect.webp icon with existing capacite.webp

- effect.webp icon was missing, causing infinite 404 errors
- Replaced all references with capacite.webp which exists
- Fixed in base-actor-sheet.mjs, base-item-sheet.mjs, mournblade-cyd2-effects.js
- Fixed in partial-active-effects.hbs and partial-item-effects.hbs templates
- Updated test script to check for effect.webp references

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

modules/applications/sheets/base-item-sheet.mjs

@@ -194,7 +194,7 @@ export default class MournbladeCYD2ItemSheetV2 extends HandlebarsApplicationMixi
       // Créer les données par défaut pour un nouvel effet
       const defaultEffectData = {
         name: game.i18n.localize("MOURNBLADECYD2.EFFECT.new") || "Nouvel Effet",
-        icon: "systems/fvtt-mournblade-cyd-2-0/assets/icons/effect.webp",
+        icon: "systems/fvtt-mournblade-cyd-2-0/assets/icons/capacite.webp",
         description: "",
         changes: [],
         disabled: false,