test(cli): the dashboard-windows fixture declares its sharingModel (#15953 slice 5, WIP)

Claude-Session: https://claude.ai/code/session_01VoSxBQujKLZKPwK2u5ehQ6
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/cli/test/verify-dashboard-windows.test.ts

@@ -43,6 +43,7 @@ const OBJECTS = [
     name: 'vdw_case',
     label: 'Case',
     pluralLabel: 'Cases',
+    sharingModel: 'private',
     fields: {
       subject: { type: 'text', label: 'Subject', required: true },
       opened_at: { type: 'datetime', label: 'Opened at' },