[BUG] Jetbrains Plugin Doesn't Support Shift+Enter in Reworked 2025 terminal engine

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [V] Other: JetBrains Plugin
• Claude CLI version: 1.0.63 (Claude Code)
• Operating System: 15.5 (24F74)
• Terminal: WebStorm terminal

Bug Description

Shift + Enter doesn't produce new lines, but submits current line when using Reworked 2025 terminal Engine

<img width="426" height="82" alt="Image" src="https://github.com/user-attachments/assets/c62ad16e-9d75-4369-a0ca-2bd6f17a327b" />

Steps to Reproduce

1. Set Terminal Engine to Reworked
2. Open Claude
3. type "Test" then hit Shift+Return

Expected Behavior

Cursor jumps to new line

Actual Behavior

Test is submitted to Claude for processing