Add dropdown item on order to copy customer checkout summary url

[LogFlames]

Adds a new dropdown item on the order page to copy the customer "checkout summary" url:

This leads to the checkout summary (e.g. https://localhost:8443/checkout/1/o_7bvFIZgqhIuGi/summary):

This is useful when doing customer support and you want to help the customer by providing them with this link, if they didn't recieve their email, or you want to check that the customer can access their tickets etc.

Currently this is only constructed in the email template, so you have to check sent emails to get this url for the specific customer.

Checklist

• I have read the contributing guidelines.
• My code is of good quality and follows the coding standards of the project.
• I have tested my changes, and they work as expected.

[Copilot]

Pull request overview

Adds an additional action in the Orders table “Manage” dropdown to copy a customer-facing checkout summary URL for a given order (to support customer support workflows without needing to look up emails).

Changes:

• Add a new menu item (“Copy customer link”) to copy the checkout summary URL to the clipboard.
• Reuse existing eventCheckoutPath and getConfig('VITE_FRONTEND_URL') to construct the full public URL.

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[daveearley]

Looks good -- thank you! If you wouldn't mind addressing Copilot's comment, then I'll merge.

[LogFlames]

Thanks for the quick response!
I've created a url helper and use it instead, and verified that it works locally running ./start-dev.sh.

[daveearley]

Merged! Thanks again. It's a useful addition.