- ProductGrid/AddToCartInlineButton/AddToCartButton now show "Ausverkauft"
and disable add-to-cart per variant (or product-level with no variants),
derived from trackInventory/stock/allowBackorder via isOutOfStock().
- AddToCartButton (todo-cards Hero+Pricing, homepage spotlight) gains the
same variant <select> AddToCartInlineButton already had — all three call
sites already fetch full product data server-side.
- /api/checkout re-validates stock server-side (depth-in-defense, not just
the disabled button), rejecting when trackInventory is on, allowBackorder
is off, and requested qty exceeds stock.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018PL4zfTY1sXc8x5QS6FatM
Marco
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