chore: Foundry v14 compatibility (min:13, max:14, verified:14)

module.json

@@ -5,8 +5,8 @@
   "version": "0.1.0",
   "compatibility": {
     "minimum": "13",
-    "verified": "13.350",
-    "maximum": "13"
+    "verified": "14",
+    "maximum": "14"
   },
   "authors": [
     {

module/sla-npc-director.mjs

@@ -123,6 +123,7 @@ class SlaNpcDirectorApp extends FormApplication {
 }
 
 function appendOpenButton(root, selector, className, label) {
+  if (!game.user?.isGM) return false;
   const header = root?.querySelector(selector);
   if (!header || header.querySelector(`.${className}`)) return false;
   const button = document.createElement("button");