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

css/fvtt-hamalron.css

@@ -3410,10 +3410,34 @@ i.fvtt-hamalron {
   font-weight: bold;
   color: var(--color-dark-1);
 }
-.fvtt-hamalron-roll-dialog .difficulty-select {
-  width: 100%;
-  text-align: center;
-  padding: 0.25rem;
+.fvtt-hamalron-roll-dialog .difficulty-row {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+.fvtt-hamalron-roll-dialog .difficulty-row .difficulty-select-input {
+  flex: 1;
+}
+.fvtt-hamalron-roll-dialog .difficulty-row .draw-difficulty-btn {
+  padding: 4px 10px;
+  background: #2a2a4a;
+  color: #e0e0e0;
+  border: 1px solid #555;
+  border-radius: 4px;
+  cursor: pointer;
+}
+.fvtt-hamalron-roll-dialog .difficulty-row .draw-difficulty-btn:hover {
+  background: #3a3a6a;
+  border-color: #e94560;
+}
+.fvtt-hamalron-roll-dialog .drawn-card-info {
+  margin-top: 4px;
+  font-size: 12px;
+  color: #e94560;
+  font-style: italic;
+}
+.fvtt-hamalron-roll-dialog .drawn-card-info#drawn-card-info {
+  display: none;
 }
 .dialog-modifier {
   display: flex;