Mouse cursor invisible in session after returning from agents view (v2.1.169 regression)

Environment:

• Claude Code v2.1.169
• Windows 11 (Windows Terminal)
• Opus 4.6 (1M context)

Steps to reproduce:

1. Start a Claude Code session normally — mouse cursor visible in input area ✅
2. Open agents view (e.g. via /bg or claude agents)
3. Navigate back to the session (left arrow)
4. Click in the text input area — mouse cursor/caret is no longer visible

Expected: Mouse cursor/caret should be visible when clicking in the input area after returning from agents view.

Actual: The cursor indicator disappears. Typing works (pressing space reveals position), but the visual cursor is gone. The issue persists for the rest of the session.

Workaround: Closing the session and opening a new one restores the cursor.

Notes:

• Does NOT happen in a fresh session without agents view navigation
• Does NOT happen inside the agents view itself (cursor works fine there)
• Likely related to the v2.1.169 fix "Fixed agents view leaving a stale/garbled frame after navigating back from an agent on WSL in Windows Terminal" — the frame fix may have introduced this cursor regression on native Windows Terminal (non-WSL)
• Not present in v2.1.168 (agents view used multiple times without this issue)