ROOT CAUSE:
Frontend blocksToMarkdown outputs NEW syntax:
- [card:type]...[/card]
- [button:style](url)Text[/button]
But backend EmailRenderer.php only had regex for OLD syntax:
- [card type="..."]...[/card]
- [button url="..."]Text[/button]
FIXES:
1. parse_cards() now handles BOTH syntaxes:
- NEW [card:type] regex first (extracts type from :type)
- OLD [card type="..."] regex for backward compatibility
2. render_card() now handles BOTH button syntaxes:
- NEW [button:style](url)Text[/button] regex
- OLD [button url="..."] regex for backward compatibility
3. Card types properly styled with inline CSS:
- hero: gradient background
- success: green background + border
- info: blue background + border
- warning: yellow background + orange border
4. Buttons rendered with full inline styles + table wrapper
for Gmail/email client compatibility
47a1e78eb7