Billing: update the payment card

[RhysSullivan]

Adds a "Payment method" row to the billing page showing the card on file.

• No card: "Add card" opens Autumn's hosted setup session. On return the page shows the card as updating and refetches until the provider's webhook sets the default card, so it appears without a reload.
• Card on file: "Update card" opens the billing portal. Verified against the live Autumn sandbox that a setup session never replaces an existing default card, so changing it goes through the portal. One refetch on return reflects the new default.
• Reads the card via the payment_method expand on the customer. No server changes.
• New e2e scenario cloud/billing-payment-method-update.test.ts covering both journeys, plus settleSetup / paymentMethod on the Autumn e2e surface.
• Bumps @executor-js/emulate to 0.14.2 for the emulated setup and portal flows.

🤖 Generated with Claude Code

session.mp4

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[github-actions]

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Torn down — the PR is closed.

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commit: 1646e6a