fix(notify): make TauriNotification.permission assignable (no-op setter)

The injected notification bridge defined `permission` as a getter-only property.
When the notification plugin / a polyfill assigned `Notification.permission`, it
threw "Cannot set property permission of function TauriNotification ... which has
only a getter" at page load. Add a no-op setter so it still reads 'granted' but
assignment can't crash.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src-tauri/src/lib.rs

@@ -58,7 +58,10 @@ const NOTIFICATION_BRIDGE: &str = r#"(function(){
   TauriNotification.prototype=Object.create(EventTarget.prototype);
   TauriNotification.prototype.constructor=TauriNotification;
   TauriNotification.prototype.close=function(){};
-  Object.defineProperty(TauriNotification,'permission',{get:function(){return 'granted';},configurable:true});
+  // get-only 'permission' threw "Cannot set property permission ... which has
+  // only a getter" when the notification plugin / a polyfill assigned it. Add a
+  // no-op setter so the value stays 'granted' but assignment can't crash.
+  Object.defineProperty(TauriNotification,'permission',{get:function(){return 'granted';},set:function(){},configurable:true});
   TauriNotification.requestPermission=function(){return Promise.resolve('granted');};
   TauriNotification.maxActions=0;
   Object.defineProperty(window,'Notification',{value:TauriNotification,writable:true,configurable:true});