[Order editing] Non-default currency order edit notice

[joshheald]

Closes: #14304

Description

This PR disables order editing for orders with a different currency compared to the site's default.

This is a workaround. If we allowed this, items on these orders would be shown in the wrong currency. See peaMlT-XF-p2 for context.

Multi-currency is not supported in the app at present, but when we add support properly, this workaround should be removed and the edit screen fixed.

Steps to reproduce

1. Launch the app and switch to a multi currency store
2. Go to the orders tab and select an order in a different currency from the store's default
3. Tap edit
4. Observe that you're shown a notice explaining that you can't edit in the app

Repeat for an order in your store's default currency – observe that you can edit it as normal.

Testing information

I added some unit tests for this, but the reliance on whether the order is synced or not was tricky. I effectively exposed that property to be mockable in tests, which is a little strange but it would have made for very brittle tests to actually allow the syncEverything function to work via lots of mocking.

I tested on an iPhone running iOS 18.1, and an iPad running iOS 17.7

Tracks event registered.

Note that I also see issues when creating an order – the order creation flow shows my site's default currency (GBP), but the order is then created in USD. I'm not really sure why that is, and it seems more drastic to disable order creation than order editing... so I've treated it as out of scope for this ticket, but will find out why and create another issue if needed.

Screenshots

edit-order-notice.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 21.1. 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.

	1 Message
📖	This PR contains changes to Tracks-related logic. Please ensure (author and reviewer) the following are completed: The tracks events must be validated in the Tracks system. Verify the internal Tracks spreadsheet has also been updated. Please consider registering any new events. The PR must be assigned the category: tracks label.

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

	App Name	WooCommerce iOS
	Build Number	pr14345-d7d69c5
	Version	21.0
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	d7d69c5
	App Center Build	WooCommerce - Prototype Builds #11482

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