Preciousuite Metal Rate Charts

1.1

• Renamed plugin to Preciousuite Metal Rate Charts for clarity and distinctiveness.
• Fixed: All HTML attribute outputs now properly escaped with esc_attr().
• Fixed: Replaced json_encode() with wp_json_encode() throughout.
• Fixed: All scripts and styles enqueued via wp_enqueue_script/style; removed inline script tags.
• Fixed: readme.txt now correctly separates Requires at least (WP version) and Requires PHP.
• Added PRECIOUSUITE_MRC_VERSION constant for consistent versioning.