New

• blog,docs: add illustrations to GDPR blog post and documentation guides
• blog: add illustrations to Gmail Postmaster Tools guide
• dashboard: enhance deliverability insights with volume chart and engagement metrics
• blog: add Google Postmaster Tools monitoring guide

Fixed

• blog: add missing image files for Gmail Postmaster Tools guide
• ci: prevent release builds from being cancelled mid-flight
• dashboard: CSP blocks fonts and Alpine.js in production #265