build(electron): app now builds and runs on macOS as a standalone app

electron/main/app-lifecycle.js

@@ -2,8 +2,13 @@ const { app, BrowserWindow, ipcMain, nativeTheme } = require('electron');
 const path = require('path');
 
 // Handle creating/removing shortcuts on Windows when installing/uninstalling.
-if (require('electron-squirrel-startup')) {
-  app.quit();
+try {
+  if (require('electron-squirrel-startup')) {
+    app.quit();
+  }
+} catch (error) {
+  // electron-squirrel-startup is not available or not needed on this platform
+  console.log('electron-squirrel-startup not available, continuing...');
 }
 
 let mainWindow;

electron/main/backend-bridge.js

@@ -6,10 +6,16 @@ const { spawn } = require('child_process');
 function runPythonCommand(command, kwargs, event) {
     const buildDir = path.resolve(__dirname, '..', '..', 'build');
     let backendPath;
+    
+    // Determine executable name based on platform
+    const executableName = process.platform === 'win32' ? 'fourdst-backend.exe' : 'fourdst-backend';
+    
     if (app.isPackaged) {
-        backendPath = path.join(process.resourcesPath, 'fourdst-backend');
+        // In packaged app, backend is in resources/backend/ directory
+        backendPath = path.join(process.resourcesPath, 'backend', executableName);
     } else {
-        backendPath = path.join(buildDir, 'electron', 'dist', 'fourdst-backend', 'fourdst-backend');
+        // In development, use the meson build output
+        backendPath = path.join(buildDir, 'electron', 'dist', 'fourdst-backend', executableName);
     }
 
     console.log(`[MAIN_PROCESS] Spawning backend: ${backendPath}`);