79e91f59ee
- Create PostGridShortcodeRegistrar for WordPress shortcode registration - Implement RenderPostGridUseCase following Clean Architecture - Add PostGridQueryBuilder for custom WP_Query construction - Add PostGridShortcodeRenderer for HTML/CSS generation - Register shortcode in DIContainer with proper DI - Add shortcode usage guide in post-grid admin panel - Fix sidebar layout: add hide_for_logged_in check to wrapper visibility Shortcode attributes: category, tag, author, posts_per_page, columns, show_pagination, show_thumbnail, show_excerpt, show_meta, etc. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>