Double line break issue on Genspark

[Neurosurgeon-boxer]

Environment

• Browser: Chrome (latest)
• Extension version: v1.1.0
• OS: macOS Tahoe 26.3 (MacBook Pro 14-inch, Apple M4 Pro)

Issue
When using Chat-Key-Changer on Genspark (https://www.genspark.ai/), pressing Enter inserts two line breaks instead of one. Every Enter keystroke produces a duplicated newline, making normal text input difficult using Japanese.

Steps to reproduce

1. Install Chat-Key-Changer
2. Open Genspark chat
3. Type a word and press Enter
4. Observe that two line breaks are inserted instead of one

Expected behavior
Enter inserts a single line break.

Actual behavior
Enter inserts two line breaks (double newline).