window.prompt duplicate entry on paste

### jArchi Version

1.12

### Archi Version

5.10.0

### Operating System

Linux Mint 22

### Description

On pasting text in window.prompt window, text is duplicated (ex: pasting "test" > renders "testtest" in the prompt)

### Steps to reproduce

1. execute the following script
```
let answer = window.prompt("Please enter your name", "Default Name");
console.log(answer)
```
2. in a text editor, write "test", copy it
3. paste it in the prompt
4. "testtest" is displayed in the prompt

Start by running the provided window.prompt script in jArchi 1.12 on Archi 5.10.0 and reproduce the paste behavior described in the issue. Trace the window.prompt entry point and its paste handling; done means pasting "test" displays one "test" and the script returns the expected value.

Written by the indexing model from the issue text.