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",
+    "verified": "14",
-    "maximum": "13"
+    "maximum": "14"
   },
   "authors": [
     {

module/sla-gear-cache.mjs

@@ -163,6 +163,7 @@ class SlaGearCacheApp extends FormApplication {
 }
 
 function installActorButton(app, html) {
+  if (!game.user?.isGM) return;
   const root = getHtmlRoot(html);
   const header = root?.querySelector(".directory-header .header-actions, .directory-header .action-buttons");
   if (!header || header.querySelector(".sla-gear-cache-open")) return;