fix: 4 bugs post-review (JSON, rangMagie, GM guard, inline styles)

- Trailing comma dans fr.json qui cassait le parsing JSON (critique)
- RANG_MAGICIEN utilisait val.name au lieu de val.label
- Bouton tirage MJ accessible aux non-GM (ajout guard game.user.isGM)
- style='flex:1' et style='display:none' externalisés dans roll.less

module/models/personnage.mjs

@@ -34,7 +34,7 @@ export default class HamalronPersonnage extends foundry.abstract.TypeDataModel {
 
     schema.historial = new fields.HTMLField({ required: true, textSearch: true })
     schema.progression = new fields.NumberField({ ...requiredInteger, initial: 0, min: 0 })
-    schema.rangMagie = new fields.StringField({ required: true, initial: "initie", choices: Object.fromEntries(Object.entries(SYSTEM.RANG_MAGICIEN).map(([key, val]) => [key, val.name])) })
+    schema.rangMagie = new fields.StringField({ required: true, initial: "initie", choices: Object.fromEntries(Object.entries(SYSTEM.RANG_MAGICIEN).map(([key, val]) => [key, val.label])) })
     schema.resistanceRecovery = new fields.ObjectField({ required: false, initial: {} })
     schema.blessureIncapacitante = new fields.BooleanField({ required: true, initial: false })
     schema.malusBlessure = new fields.NumberField({ required: true, integer: true, initial: 0, min: -8, max: 0 })