UI: Text flashing/shaking rapidly after context compaction in WSL2

Environment

• OS: Linux (WSL2 — kernel 6.6.87.2-microsoft-standard-WSL2)
• Claude Code version: latest (session 2026-02-18)

Steps to Reproduce

1. Run a long session with many tool calls (context usage rises to near-compaction threshold)
2. Context refresh/compaction occurs
3. Immediately after refresh, some text in the prompt area begins flashing/shaking rapidly

Observed Behavior

• The prompt text and 2 lines above it flash and shake rapidly
• Started immediately after context refresh
• Stopped after answering an AskUserQuestion prompt (workspace selection)
• Recurred later in the same session during another burst of tool calls

Expected Behavior

Text should remain static and not animate unexpectedly.

Notes

• The flashing stopped on its own after user interaction
• Did not cause loss of functionality — purely visual
• Appears correlated with high-frequency tool call bursts or context compaction events