fix desktop backend url

main.js

@@ -1,6 +1,7 @@
 const { app, BrowserWindow, session, desktopCapturer, ipcMain, clipboard } = require('electron');
 const { autoUpdater } = require('electron-updater');
 const path = require('path');
+const packageJson = require('./package.json');
 
 const updateState = {
     status: 'idle', // idle | checking | available | downloading | downloaded | not-available | error
@@ -24,6 +25,22 @@ function isNewerVersionAvailable(info) {
 
 let updateCheckInProgress = false;
 
+function resolveBackendUrl() {
+    const configuredUrl = (process.env.CHATTZ_URL || process.env.APP_BASE_URL || '').trim();
+    if (configuredUrl) {
+        return configuredUrl.replace(/\/$/, '');
+    }
+
+    const packagedFallback = typeof packageJson.homepage === 'string'
+        ? packageJson.homepage.trim()
+        : '';
+    if (app.isPackaged && packagedFallback) {
+        return packagedFallback.replace(/\/$/, '');
+    }
+
+    return 'http://localhost:3000';
+}
+
 async function runUpdateCheck(reason = 'manual') {
     if (updateCheckInProgress) {
         console.log(`Update check skipped (${reason}): another check is already in progress`);
@@ -56,8 +73,9 @@ async function runUpdateCheck(reason = 'manual') {
 
 function createWindow() {
     const sess = session.fromPartition('persist:chattz');
-    const backendUrl = (process.env.CHATTZ_URL || process.env.APP_BASE_URL || 'http://localhost:3000').replace(/\/$/, '');
+    const backendUrl = resolveBackendUrl();
     const backendOrigin = new URL(backendUrl).origin;
+    console.log(`Desktop backend URL: ${backendUrl}`);
 
     const win = new BrowserWindow({
         width: 1200,