The form was posting to the save route on every input change (which would
save the product on every keystroke). Added a dedicated POST
/admin/affiliate/preview route that renders the product_card.html partial
from form data without touching the database.
Form now keeps action pointing to the save route; an invisible hx-div
triggers preview-only POSTs via hx-include="#affiliate-form".
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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