[Bug]: Terminal (JT) renders pasted commands with visual artifacts - cursor position and username disappear

### Apache Hop version?

2.18

### Java version?

21.0.11

### Operating system

macOS

### What happened?

When pasting a command into the integrated Hop terminal (JT tab), the pasted text renders to the right of the current cursor position instead of replacing it, and the username/prompt disappears visually.
The pipeline executes correctly, this is purely a rendering issue in the terminal UI.
**Steps to reproduce:**
1. Open Hop GUI
2. Open the integrated terminal (JT tab)
3. Copy a hop-run.sh command
4. Paste it into the terminal with Cmd+V

### Issue Priority

Priority: 3

### Issue Component

Component: Hop Gui

Reproduce the issue in the Hop GUI's integrated terminal (JT tab) on macOS by pasting a hop-run.sh command with Cmd+V. Compare the terminal rendering before and after pasting; done means the command replaces the text at the cursor, the username and prompt remain visible, and execution continues correctly.

Written by the indexing model from the issue text.