feat: implement full-featured DataTable component

Implement comprehensive DataTable with all Grid.js features:
- Checkbox selection with "Select All"
- Bulk delete button (shows when rows selected)
- Inline row actions (edit, delete, duplicate) on hover
- Status filter tabs with counts
- Search input with debounce
- Sort dropdown (ID, date, title ASC/DESC)
- Server-side pagination
- "Add New" modal with SweetAlert2
- SweetAlert2 loaded via WordPress global scope

Updated Forms page to use new DataTable component with:
- Full column rendering (ID, title, date, status, shortcode)
- Copy shortcode button with toast notification
- All filter, search, sort, pagination features

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

build/admin-rtl.css

@@ -3,6 +3,6 @@
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