UI panel goes blank after tool execution with no user prompt

Description

The Claude Code panel went completely blank during a tool execution sequence. No user prompt appeared for tool approval/rejection, but the assistant received a rejection error with user feedback.

Steps to Reproduce

1. Assistant executed: git config user.name | tr '[:upper:]' '[:lower:]' | tr ' ' '-'
2. Command succeeded and returned "jim-sander"
3. Assistant attempted to execute: mkdir -p ~/repos/platform-utilities/docs/contributors/jim-sander/PANK-1929
4. Panel went blank on user side
5. No approval/rejection prompt appeared to user
6. Assistant received error: "The user doesn't want to proceed with this tool use. The tool use was rejected"

Expected Behavior

• User should see a prompt to approve/reject tool execution
• Panel should remain visible and responsive
• Tool execution flow should be clear to user

Actual Behavior

• Panel went blank with no content visible
• No prompt appeared for user interaction
• Assistant and user state got out of sync (assistant saw rejection, user saw nothing)

Environment

• macOS (Darwin 25.0.0)
• Claude Code (latest version as of 2025-11-21)
• Working directory: /Users/jimsander/repos/platform-github-actions
• Model: claude-sonnet-4-5-20250929

Additional Context

This appears to be a UI rendering/state synchronization issue where:

1. Tool execution happens
2. Response handling breaks
3. Panel fails to render
4. User interaction flow is interrupted

The underlying commands actually succeeded, but the UI failed to display the results or prompt for approval.