[WIP] Add warning banner for currency mismatch on dashboard

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Show a warning banner when site's and user's currency mismatch

The Woo app is not designed to work properly when the site's and the user's currencies mismatch. At least, it can create customer confusion. At worst, we can get payment failures.

We've already done some work, for example, logging when we detect the mismatch, but I don't think we do anything else.

If we don't support this case, it's better to communicate it as early as possible to the customer. For example, displaying a dismissible warning banner on the dashboard that:

Tells about the problem and that the app may not work properly

Provide instructions or an automated CTA to change the account's currency to the default site's currency

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Use existing elements to show warnings or messages within dashboard, don't reinvent anything

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[dangermattic]

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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	pr16274-9e9cdd9
	Version	23.5
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	9e9cdd9
	Installation URL	20nf5j3uea9b0

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