Add campaign publish checklist

[Errordog2]

Closes #275

Summary

• add campaign publish checklist rules for blockers, warnings, and ready states
• add a dashboard-only CampaignPublishChecklistPanel for pre-publish readiness review
• validate campaign identity, draft inventory/content, safe demo recipients, tags, and archived status
• cover ready, blocked, unsafe recipient, and warning-only scenarios with focused tests

Validation

px prettier --check src/features/demo-admin-dashboard/campaignPublishChecklist.ts src/features/demo-admin-dashboard/components/CampaignPublishChecklistPanel.tsx src/features/demo-admin-dashboard/tests/campaignPublishChecklist.test.ts src/features/demo-admin-dashboard/index.ts

• git diff --check
• sensitive scan for account/payment/private-key markers returned no matches

Note: targeted Vitest could not start in this fresh workspace because
ode_modules is not installed and the project Vite plugins are unavailable locally. The PR includes the focused unit test file for normal CI dependency installation.