build(webpack): change to nosources-source-map

as per https://webpack.js.org/configuration/devtool/#production

serving the `source-map` file to "normal" users seems to be not recommended, so instead let's go with `nosources-source-map`:

a) this drastically reduces app-dist folder size from 20MB down to 8.7MB
b) it still allows for stack traces

webpack.config.ts

@@ -75,7 +75,7 @@ const config: Configuration = {
             ".mjs": [".mjs", ".mts"]
         }
     },
-    devtool: "source-map",
+    devtool: "nosources-source-map",
     target: "electron-renderer"
 };