feat: Complete markdown syntax refinement and variable protection

✅ New cleaner syntax implemented:
- [card:type] instead of [card type='type']
- [button:style](url)Text[/button] instead of [button url='...' style='...']
- Standard markdown images: ![alt](url)

✅ Variable protection from markdown parsing:
- Variables with underscores (e.g., {order_items_table}) now protected
- HTML comment placeholders prevent italic/bold parsing
- All variables render correctly in preview

✅ Button rendering fixes:
- Buttons work in Visual mode inside cards
- Buttons work in Preview mode
- Button clicks prevented in visual editor
- Proper styling for solid and outline buttons

✅ Backward compatibility:
- Old syntax still supported
- No breaking changes

✅ Bug fixes:
- Fixed order_item_table → order_items_table naming
- Fixed button regex to match across newlines
- Added button/image parsing to parseMarkdownBasics
- Prevented button clicks on .button and .button-outline classes

📚 Documentation:
- NEW_MARKDOWN_SYNTAX.md - Complete user guide
- MARKDOWN_SYNTAX_AND_VARIABLES.md - Technical analysis

includes/Admin/Assets.php

@@ -58,6 +58,7 @@ class Assets {
             'standaloneMode'  => false,
             'wpAdminUrl'      => admin_url('admin.php?page=woonoow'),
             'isAuthenticated' => is_user_logged_in(),
+            'pluginUrl'       => trailingslashit(plugins_url('/', dirname(__DIR__))),
         ]);
         wp_add_inline_script($handle, 'window.WNW_CONFIG = window.WNW_CONFIG || WNW_CONFIG;', 'after');
         
@@ -162,6 +163,7 @@ class Assets {
             'standaloneMode'  => false,
             'wpAdminUrl'      => admin_url('admin.php?page=woonoow'),
             'isAuthenticated' => is_user_logged_in(),
+            'pluginUrl'       => trailingslashit(plugins_url('/', dirname(__DIR__))),
         ]);
         
         // WordPress REST API settings (for media upload compatibility)