Contracts with no saved payment method now tell you what to do

Running "Send update payment method link" from Contracts → Bulk actions on a contract with no saved card used to end in a generic error in the results file, while your inbox still received a "Your Contracts Bulk Action is Completed" email with no explanation of what went wrong or what to do instead. The bulk action now names the exact remedy in the results: ask the customer to add a card using "Send payment method request email" from Create subscription.

On the contract page itself, a subscription with no saved card used to show no payment-method section at all, so there was no way to tell whether the card was missing or simply hidden, and no way to act on it from that page. The page now shows a clear "No payment method on file" message with a button to email the customer a link to add one, using the same request flow and confirmation as Create subscription.

Contracts without a saved card have been a normal, supported state since manual subscription creation shipped in March; this fix closes a gap in the bulk action, which predates that change and never accounted for it.