[BUG] Conversation compaction loses entire history, ctrl+e unresponsive

Description

After conversation compaction, the entire conversation history is lost. Only the compact summary notes remain visible.

Steps to Reproduce

1. Work on a task until compaction triggers
2. After compaction completes, conversation shows only compact notes
3. Previous messages/task context completely gone

Expected Behavior

• Compacted conversation should preserve context
• Ctrl+O should restore previous messages
• Ctrl+E should show full transcript

Actual Behavior

• Entire last task forgotten after compaction
• Ctrl+O only shows compact notes (not full history)
• Ctrl+E does not respond / no full transcript available
• Conversation effectively lost

Impact

Task progress lost, must restart work from scratch.

Environment

• Platform: Windows
• Application: Claude Code CLI