Bug Description

Agent responses in the webchat UI are not rendering. Both long and short messages disappear from the chat interface after being sent.

Impact

• Critical: Part of the monitoring/problem detection system depends on text being visible in the webchat UI
• All agent responses are invisible to the user — the system is unusable in this state

Steps to Reproduce

1. Open the OpenClaw webchat UI (openclaw-control-ui)
2. Send any message to the agent
3. Agent responds (confirmed via logs/API) but the response is not displayed
4. Initially only long responses were missing, now ALL responses (even short ones) have disappeared

Expected Behavior

Agent responses should render in the webchat UI consistently, regardless of length.

Environment

• OpenClaw: latest (npm)
• OS: macOS (Darwin 25.3.0, arm64)
• Node: v25.8.1
• Channel: webchat
• Surface: openclaw-control-ui

Notes

• The agent IS responding (confirmed by continued conversation flow)
• This may be a frontend rendering issue in the webchat component
• Started with long responses not showing, escalated to all responses vanishing