v1.23.0

✨ Added

• Dashboard: 5 new widgets — category distribution doughnut, weekly activity bar chart, series overview, CMS overview, SEO checklist
• Dashboard: widget picker in Settings → Dashboard to enable/disable widgets
• Dashboard: edit action on recent posts table to open post editor
• Dashboard: column toggling and filters (status, category, date range) on recent posts table
• Dashboard: reading time column on recent posts table

🎨 Changed

• Dashboard: improve layout with variable column spans (BlogPostsChart 2/3, BlogReadingStats 1/3, ScheduledPosts 1/2)
• Dashboard: BlogStatsOverview shows 8 stats (added series, CMS pages), cached 5 min, displayed 4 per row
• Dashboard: BlogPostsChart shows both created and published series with separate colors
• Dashboard: BlogReadingStats now cached 5 min, labels shortened
• Dashboard: Scheduled Posts heading shows live count
• Dashboard: compact stat cards with 4 columns per row

🔥 Removed

• Dashboard: remove QuickVisitSite widget (redundant with left nav "View Website" link)

🐛 Fixed

• PHPStan: raise analysis level from 5 to 9, regenerate baseline