Fix roll dialog CSS + JS: template <div> wrapper, moon-section, selectors

- Remplace <form class='roll-dialog celestopol'> par <div class='roll-dialog-content'>
  pour éviter les formulaires HTML imbriqués invalides (DialogV2 a son propre <form>)
- Corrige le sélecteur CSS de .roll-dialog.celestopol vers .application.roll-dialog .roll-dialog-content
- Remplace .form-group.form-moon par .moon-section (classe custom) pour éviter
  les conflits avec le CSS grid de FoundryVTT standard-form (label 130px de hauteur)
- Met à jour le script JS inline pour utiliser document.querySelector('.roll-dialog-content')
- Ajoute white-space: nowrap sur le label Destin pour éviter le wrapping sur 3 lignes
- Supprime .application.roll-dialog .window-content padding override (remplacé par dialog-content)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

fvtt-celestopol.mjs

@@ -65,35 +65,35 @@ Hooks.once("init", () => {
 
   // ── Sheets: unregister core, register system sheets ─────────────────────
   foundry.applications.sheets.ActorSheetV2.unregisterSheet?.("core", "Actor", { types: ["character", "npc"] })
-  Actors.unregisterSheet("core", ActorSheet)
-  Actors.registerSheet(SYSTEM_ID, CelestopolCharacterSheet, {
+  foundry.documents.collections.Actors.unregisterSheet("core", ActorSheet)
+  foundry.documents.collections.Actors.registerSheet(SYSTEM_ID, CelestopolCharacterSheet, {
     types: ["character"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.character",
   })
-  Actors.registerSheet(SYSTEM_ID, CelestopolNPCSheet, {
+  foundry.documents.collections.Actors.registerSheet(SYSTEM_ID, CelestopolNPCSheet, {
     types: ["npc"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.npc",
   })
 
-  Items.unregisterSheet("core", ItemSheet)
-  Items.registerSheet(SYSTEM_ID, CelestopolAnomalySheet, {
+  foundry.documents.collections.Items.unregisterSheet("core", ItemSheet)
+  foundry.documents.collections.Items.registerSheet(SYSTEM_ID, CelestopolAnomalySheet, {
     types: ["anomaly"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.anomaly",
   })
-  Items.registerSheet(SYSTEM_ID, CelestopolAspectSheet, {
+  foundry.documents.collections.Items.registerSheet(SYSTEM_ID, CelestopolAspectSheet, {
     types: ["aspect"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.aspect",
   })
-  Items.registerSheet(SYSTEM_ID, CelestopolAttributeSheet, {
+  foundry.documents.collections.Items.registerSheet(SYSTEM_ID, CelestopolAttributeSheet, {
     types: ["attribute"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.attribute",
   })
-  Items.registerSheet(SYSTEM_ID, CelestopolEquipmentSheet, {
+  foundry.documents.collections.Items.registerSheet(SYSTEM_ID, CelestopolEquipmentSheet, {
     types: ["equipment"],
     makeDefault: true,
     label: "CELESTOPOL.Sheet.equipment",
@@ -144,7 +144,15 @@ function _registerHandlebarsHelpers() {
     return args.reduce((acc, key) => (acc && acc[key] !== undefined ? acc[key] : undefined), obj)
   })
 
-  // Helper : let (scope variable assignment inside template)
+  // Helper : negate a number (abs value helper)
+  Handlebars.registerHelper("neg", n => -n)
+
+  // Helper : absolute value
+  Handlebars.registerHelper("abs", n => Math.abs(n))
+
+  // Helper : add two numbers
+  Handlebars.registerHelper("add", (a, b) => a + b)
+
   Handlebars.registerHelper("let", function(value, options) {
     return options.fn({ value })
   })