PreCompact hook statusMessage spinner not displayed

Bug description

The statusMessage property configured on a PreCompact hook handler is not displayed as a spinner while the hook runs. The hook itself executes successfully, but no custom spinner message appears.

Steps to reproduce

1. Configure a PreCompact hook in ~/.claude/settings.json:

{
  "hooks": {
    "PreCompact": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "sleep 10 && echo done",
            "timeout": 120,
            "statusMessage": "Custom spinner message..."
          }
        ]
      }
    ]
  }
}

1. Start a Claude Code session, fill context, then run /compact
2. Observe that no "Custom spinner message..." spinner is shown during the hook execution

Expected behavior

A spinner with the text "Custom spinner message..." should be displayed while the PreCompact hook command is running (for ~10+ seconds, clearly visible).

Actual behavior

No spinner is displayed. After the hook completes, the result appears as dim text:

Compacted (ctrl+o to see full summary)
PreCompact [sleep 10 && echo done] completed successfully: done

The hook runs and completes successfully — only the statusMessage UI feedback is missing.

Environment

• Claude Code version: 2.1.42
• OS: macOS (Darwin 25.0.0)
• Shell: zsh

Notes

• The same statusMessage field on SessionStart hooks also does not appear to show a spinner (though SessionStart hooks typically complete too quickly to notice).
• Issue #16002 reports a different statusMessage problem (PreToolUse rendering repeatedly). This issue is about statusMessage not rendering at all for PreCompact.