Минимальная заготовка. Без стилей, но уже ведёт расчёты

package-lock.json

@@ -9,7 +9,8 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
-        "electron-squirrel-startup": "^1.0.1"
+        "electron-squirrel-startup": "^1.0.1",
+        "izitoast": "^1.4.0"
       },
       "devDependencies": {
         "@electron-forge/cli": "^7.11.1",
@@ -5404,6 +5405,12 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/izitoast": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/izitoast/-/izitoast-1.4.0.tgz",
+      "integrity": "sha512-Oc1X2wiQtPp39i5VpIjf3GJf5sfCtHKXZ5szx7RareyEeFLUlcEW0FSfBni28+Ul6KNKZRKzhVuWzSP4Xngh0w==",
+      "license": "Apache-2.0"
+    },
     "node_modules/jest-worker": {
       "version": "27.5.1",
       "resolved": "https://registry.npmjs.org/jest-worker/-/jest-worker-27.5.1.tgz",