[Woo POS] Coupons: Creation (with dummy entry point UI)

[staskus]

Description

On POS, show existing IPP Coupon creation via a dummy entry point UI.

The main goal was to reuse two existing views:

• AddEditCoupon
• BottomSheetListSelectorViewController

I emulated the flow from the IPP flow:
Show BottomSheetListSelectorViewController for selecting coupon type (percentage / fixed) and then show AddEditCoupon for configuring the view.

I created POSCouponCreationSheet to encapsulate all the logic. The main complexity was around all the completion handlers so the modal dismissing and navigation would work properly on POS with SwiftUI.

The most notable change was to only refresh the view when the coupon success view is dismissed, not when the coupon code is successfully created to avoid issues that happen when the list is refreshed and the sheet still presented.

Steps to reproduce

Prerequisites: Enable enableCouponsInPointOfSale feature flag

1. Open POS
2. Select Coupons
3. Tap +, confirm 'Discount Type Selection' sheet appears
4. Confirm cancel closes, confirm cannot be dismissed with gesture
5. Select discount type, confirm 'Coupon Creation' sheet opens
6. Try to navigate in as many views as possible, change coupon codes, change values, change restrictions, dismiss and reopen
7. After configuring, tap create
8. Confirm success view appears
9. Dismiss the success view
10. Confirm coupon list is refreshed and a new coupon appears
11. Try to apply the coupon
12. Confirm the application works as expected

Testing information

Tested on both iOS 18 and iOS 17 to confirm that modal presentation works correctly. Put focus on testing as many dismissal, coming back and success combinations as possible.

Screenshots

new_coupon_flow.mp4

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on all devices (phone/tablet) and no regressions are added.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 22.1. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	29141
	Version	PR #15467
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	a0633a4
	Installation URL	11ih3le5a2ehg

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