Add macOS icon to assets/icons directory and configure electron-builder

Co-authored-by: sumitduster-iMac <[email protected]>

Author: Copilot

assets/icons/macos-icon.png

@@ -33,7 +33,8 @@
         }
       ],
       "category": "public.app-category.developer-tools",
-      "identity": null
+      "identity": null,
+      "icon": "assets/icons/macos-icon.png"
     },
     "files": [
       "main.js",