[AnthonyRonning]

Stacked on #1564, which adds the plan helpers this uses. Review that one first; this PR's diff is the iOS paywall only.

What changes

The iOS paywall sells Pro and Max from two fixed App Store identifiers. The web pricing page (in #1564) already offers any individual plan billing lists that has no card of its own as a larger size of the plan below it. This does the same on iOS.

• Where the size comes from: billing's product list can now name the App Store product that sells a plan monthly (apple_product_id). A listed plan with such a product and no card of its own becomes a size of the highest plan below it.
• What the subscriber sees: a size switch on that plan's card, labelled with the App Store's own prices. Picking a size changes the card's title, price, first feature line and button, and the purchase uses that size's product.
• Current plan: a subscriber on the larger size sees it selected, with the manage button. The plan's own size stays one pick away.

Behavior that does not change

• Pro and Max keep their fixed identifiers. If the product list cannot be loaded, or billing is older and sends no apple_product_id, the paywall is exactly as before.
• A size the App Store does not return a valid monthly product for is not offered and is not an error. The existing "some plans are unavailable" message still depends only on Pro and Max.
• A size is offered only while its plan has an App Store price.
• Conflict, pending-approval, restore, retry and manage logic is unchanged; a purchase awaiting approval blocks both sizes.

Validation

The repository's commit hook for Research: format check, lint, type check and the full test suite (1,196 tests, 0 failures). New tests cover the size lookup and its refusals, the product hook requesting and validating sizes, and the switch on the card (picking, buying, a subscriber on the larger size, a pending purchase). Test fixtures use an invented plan.

Not run: the paywall on a device or simulator, a StoreKit purchase of a size, or the page against a billing server that lists one.

🤖 Generated with Claude Code

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[github-actions]

Maple development preview: https://5576e21b.maple-ca8.pages.dev

Commit: 335d48fb93d40a87dc38138df1a687ff891b3f40

Uses development API, billing, flags and PCR configuration. Cloudflare Access applies.