Add product thumbnail to back-in-stock email, left-align notify button text

renderBackInStockHtml() (and sendBackInStockEmails.ts on the backend)
now show a small product image above the product name, when the
product has one. Also left-aligns NotifyMeForm's button text to match
the email input's own left-aligned placeholder — was centered, read
as inconsistent next to it.

Also adds the klaro dependency, ahead of swapping the custom cookie
banner for it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/components/NotifyMeForm.tsx

@@ -74,7 +74,7 @@ export function NotifyMeForm({ productId, variantName = "" }: { productId: numbe
       <button
         type="submit"
         disabled={status === "submitting"}
-        className="w-full rounded-sm border border-border px-4 py-2 text-body-sm font-semibold text-text-primary hover:border-brand transition-colors disabled:opacity-60 disabled:cursor-not-allowed"
+        className="w-full rounded-sm border border-border px-4 py-2 text-left text-body-sm font-semibold text-text-primary hover:border-brand transition-colors disabled:opacity-60 disabled:cursor-not-allowed"
       >
         {status === "submitting" ? "…" : "Benachrichtigen"}
       </button>