JetBrains plugin: mouse scroll stopped working in Claude Code panel

Description

Mouse wheel scrolling stopped working in the Claude Code panel in PyCharm. It was working previously with no changes made by the user. Page Up/Down keys work as a workaround. There is no visible scrollbar in the panel. Mouse scroll works normally in all other PyCharm panels (e.g. file viewer).

Steps to Reproduce

1. Open PyCharm with Claude Code plugin installed
2. Open the Claude Code panel
3. Generate a response long enough to require scrolling
4. Attempt to scroll with the mouse wheel

Expected Behavior

Mouse wheel scrolls the Claude Code panel output.

Actual Behavior

Mouse wheel does nothing. No scrollbar is visible. Page Up/Down works.

Environment

• OS: Linux (kernel 6.8.0-124-generic, Ubuntu)
• PyCharm version: Build #PY-252.25557.178, built on September 2, 2025
• Claude Code plugin version: 0.1.14-beta

Additional Notes

• Rebooting did not fix the issue
• Clicking inside the panel to ensure focus does not help
• Plugin is up to date (no updates available)
• Issue appeared suddenly without any user-side changes