We're talking about ways to do multiplatform applications, which includes the web. You suggested Pascal but that doesn't run on the web without changing the code. Enclosing the application in Electron shell does not mean it's the only way it's going to be ran, actually most of the time you do it because you already have a web application and a server.

You can't run an Electron app on the web without changing code either, seeing as it's a browser AND a webserver combo.

You also don't take a webapp and separate server and just drop the two into a folder and run it as an Electron app without changing code

Not true. You can code the app in a way that allows you to share code completely between web, server and Electron app; there will just be a little boilerplate in the Electron app around it.