// Session frame preload: no page bridge, Node engine, filesystem API or clipboard payloads.
if(process.sandboxed!==true||process.contextIsolated!==true){require('electron').ipcRenderer.send('managed:clipboard-sandbox-failure');window.stop();throw Error('Managed renderer isolation is required');}
// Freeze the legacy command primitive in the page realm. Document.open() removes
// DOM listeners, but cannot replace this non-configurable prototype property.
try {
  require('electron').contextBridge.executeInMainWorld({func:()=>{
    const prototype=Document.prototype,existing=Object.getOwnPropertyDescriptor(prototype,'execCommand');
    if(existing?.value?._managedClipboardGuard===true&&!existing.configurable)return;
    const original=prototype.execCommand,apply=Reflect.apply,test=RegExp.prototype.test.bind(/^(copy|cut|paste)/i);
    function managedClipboardCommand(command,...args){
      if(typeof command!=='string'||test(command))return false;
      return apply(original,this,[command,...args]);
    }
    Object.defineProperty(managedClipboardCommand,'_managedClipboardGuard',{value:true});
    Object.defineProperty(prototype,'execCommand',{value:managedClipboardCommand,writable:false,configurable:false});
    // Replacement clears security listeners; these unsupported legacy APIs fail closed.
    const SecurityException=DOMException;
    const denyReplacement=()=>{throw new SecurityException('Managed document replacement is disabled','SecurityError');};
    for(const name of ['open','write','writeln'])Object.defineProperty(prototype,name,{value:denyReplacement,writable:false,configurable:false});
  }});
} catch {
  require('electron').ipcRenderer.send('managed:clipboard-sandbox-failure');
  window.stop();
  throw Error('Managed clipboard primitive could not be protected');
}
for(const name of ['copy','cut','paste','dragstart','dragover','drop'])window.addEventListener(name,event=>{event.preventDefault();event.stopImmediatePropagation();},true);
window.addEventListener('beforeinput',event=>{if(/^(insertFromPaste|insertFromDrop|deleteByCut)/.test(event.inputType||'')){event.preventDefault();event.stopImmediatePropagation();}},true);