ECTO-2555 - Display hint when upgrading access granted IAP

[Jannik (qysp)]

I've also noticed that some of the properties of the subscription change struct are incorrect and fixed it.

[Copilot]

Pull request overview

Adds UI messaging in the administration checkout flow to warn users when an “access granted” in-app purchase upgrade will permanently remove free access, and extends the subscription-change data model to support richer downgrade/pending-downgrade data.

Changes:

• Extend InAppPurchaseSubscriptionChangeStruct to include a nullable pendingDowngrade struct, isIncludedInPluginLicense, and change currentNetPrice to float.
• Introduce InAppPurchasePendingDowngradeStruct (+ corresponding TS types) to represent pending downgrade details.
• Add administration UI + styling + unit tests to render a new “attention” banner and show “free” when included in a plugin license.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Struct/InAppPurchaseSubscriptionChangeStruct.php	Extends subscription-change struct (pending downgrade struct, net price type, plugin-license inclusion flag).
src/Struct/InAppPurchasePendingDowngradeStruct.php	New struct representing pending downgrade feature + net price.
src/Resources/app/administration/src/module/sw-in-app-purchases/types/index.ts	Updates admin TS types to reflect new pending downgrade shape and inclusion flag.
src/Resources/app/administration/src/module/sw-in-app-purchases/snippet/en.json	Adds new translation strings for the new banner and “free” label.
src/Resources/app/administration/src/module/sw-in-app-purchases/snippet/de.json	Adds German translation strings for the new banner and “free” label.
src/Resources/app/administration/src/module/sw-in-app-purchases/component/sw-in-app-purchase-checkout-subscription-change/sw-in-app-purchase-checkout-subscription-change.spec.js	Adds component unit tests for the new computed flag and banner rendering.
src/Resources/app/administration/src/module/sw-in-app-purchases/component/sw-in-app-purchase-checkout-subscription-change/sw-in-app-purchase-checkout-subscription-change.scss	Styles the new banner block.
src/Resources/app/administration/src/module/sw-in-app-purchases/component/sw-in-app-purchase-checkout-subscription-change/sw-in-app-purchase-checkout-subscription-change.html.twig	Renders “free” label conditionally and adds the attention banner.
src/Resources/app/administration/src/module/sw-in-app-purchases/component/sw-in-app-purchase-checkout-subscription-change/index.ts	Adds computed isIncludedInPluginLicense and getCurrentPlanName used by the template/banner.

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