1. EmailRenderer: Added button parsing with full inline styles
- Buttons now use table-based layout for email client compatibility
- Solid and outline button styles with custom colors from settings
2. DefaultTemplates: Updated new_customer template
- Added 'Set Your Password' button for auto-registered users
- Uses {set_password_url} variable for password reset link
3. EmailRenderer: Added set_password_url variable
- Generates secure password reset link for new customers
- Also added my_account_url and shop_url to customer variables
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