v0.5.0 — Newsletter Subscriptions & Stats Dashboard

- Newsletter System: Full subscriber management with import, email confirmation, and unsubscribe workflows - Email Campaigns: Send newsletters to your subscribers when you publish, with template support and email alias configuration - Analytics Dashboard: Substack-style stats overview with interactive charts, timeframe filtering, and cumulative growth tracking - Image Paste & Crop: Drag-and-drop and clipboard image support in the editor, plus a built-in cropping modal - Markdown Paste: Paste markdown content and it auto-converts to rich editor blocks - AT Protocol Sync Verification: Manual sync button and verification settings so you can confirm your content is in sync - "Edited" Badge: Articles with unpublished changes now show an edited indicator - Cloudflare R2 Storage: Media files served from Cloudflare R2 for faster, more reliable delivery