Upgrade Electron packages and migrate to ESM

electron/eslint.config.mjs

@@ -41,4 +41,26 @@ export default [
       'no-plusplus': 'off',
     },
   },
+  // CommonJS files (preload scripts must be CJS when sandbox is enabled)
+  {
+    files: ['**/*.cjs'],
+    plugins: {
+      prettier: prettierPlugin,
+    },
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'commonjs',
+      globals: {
+        ...globals.node,
+        ...globals.es2021,
+      },
+    },
+    rules: {
+      'prettier/prettier': 'error',
+      ...prettierConfig.rules,
+      'max-len': 'off',
+      'no-unused-vars': 'warn',
+      'no-plusplus': 'off',
+    },
+  },
 ];

electron/main.js

@@ -4,14 +4,19 @@
  * Handles window creation, IPC communication, and app lifecycle.
  */
 
-const { app, BrowserWindow, ipcMain } = require('electron');
-const path = require('path');
-const url = require('url');
+import { app, BrowserWindow, ipcMain } from 'electron';
+import path from 'path';
+import url from 'url';
+import { fileURLToPath } from 'url';
+
+// ESM equivalent of __dirname
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
 
 // Services
-const ConnectionManager = require('./services/ConnectionManager');
-const VersionChecker = require('./services/VersionChecker');
-const MDNSDiscovery = require('./services/MDNSDiscovery');
+import ConnectionManager from './services/ConnectionManager.js';
+import VersionChecker from './services/VersionChecker.js';
+import MDNSDiscovery from './services/MDNSDiscovery.js';
 
 // Determine if running in development mode
 const isDev = process.argv.includes('--dev') || process.env.NODE_ENV === 'development';
@@ -32,7 +37,7 @@ function createWindow() {
     minWidth: 800,
     minHeight: 600,
     webPreferences: {
-      preload: path.join(__dirname, 'preload.js'),
+      preload: path.join(__dirname, 'preload.cjs'),
       nodeIntegration: false,
       contextIsolation: true,
       sandbox: true,