[BUG] JetBrains plugin: scrollbar missing in Claude Code tool window

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment:

• Claude Code JetBrains plugin version: 0.1.14 beta
• IDE: IntelliJ IDEA (version: IntelliJ IDEA 2025.1.1.1 (Ultimate Edition) Build #IU-251.25410.129, built on May 9, 2025)
• OS: Linux (Fedora, kernel 7.1.5-201.fc44.x86_64)

Description:
The scrollbar in the Claude Code tool window has disappeared. Previously it was visible and allowed scrolling through the conversation; now it is no longer shown, making it harder to navigate long conversations.

What Should Happen?

The scrollbar should be visible when content overflows, consistent with other IntelliJ tool windows.

Error Messages/Logs

Steps to Reproduce

1. Open the Claude Code tool window in IntelliJ IDEA
2. Have a conversation long enough to require scrolling
3. Observe that no scrollbar is rendered in the panel

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code JetBrains plugin version: 0.1.14 beta

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Restarting the IDE / disabling-reenabling the plugin doesn't resolve the issue