ROOT CAUSE (from screenshot DevTools):
href="<span style=...>[login_url]</span>" - HTML span inside href attribute!
Flow causing the bug:
1. parseCardsForPreview converts [button url="{login_url}"] to <a href="{login_url}">
2. sampleData replacement runs but login_url NOT in sampleData
3. Variable highlighting injects <span>[login_url]</span> INTO href="..."
4. HTML is completely broken
FIXES APPLIED:
1. Added missing URL variables to sampleData:
- login_url, reset_link, reset_key
- user_login, user_email, user_temp_password
- customer_first_name, customer_last_name
2. Changed variable highlighting from HTML spans to plain text [variable]
- Prevents breaking HTML attributes if variable is inside href, src, etc.
6bd50c1659