feat(orders): ORDERS-7935 add badge for CANCELLED order returns

[jpajar]

What?

This PR adds the CANCELLED badge and displays it for order returns that have been cancelled.

Requirements

• CHANGELOG.md entry added (required for code changes only)

Tickets / Documentation

https://bigcommercecloud.atlassian.net/browse/ORDERS-7935

Screenshots (if appropriate)

Returns listing page

Returns details page

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Note

Low Risk
Presentation-only template and stylesheet updates for an additional return status; no auth, API, or data-flow changes.

Overview
Cancelled returns now show a dedicated status badge on the account returns list and return details pages when status is CANCELLED, using the same pattern as open, in progress, and closed.

New SCSS modifiers (account-orderStatus-label--cancelled and returnDetails-statusBadge--cancelled) apply a dark grey background with bright white text so cancelled returns are visually distinct from closed returns.

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[denis-bc]

For my understanding, is it a UX requirement to have sharp badge corners on one page but smooth on another? 🤔

[Copilot]

Pull request overview

Adds UI support for displaying a CANCELLED status badge for order returns in the account experience, aligning cancelled returns with the existing badge pattern for open/in-progress/closed states.

Changes:

• Render CANCELLED status badges on the returns list (v2) and return details pages.
• Add SCSS modifiers for cancelled badge styling (dark grey background, bright white text).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
templates/pages/account/return-details.html	Adds conditional rendering for the CANCELLED return status badge on the return details page.
templates/components/account/returns-list-v2.html	Adds conditional rendering for the CANCELLED return status badge on the returns list v2 component.
assets/scss/components/stencil/returnDetails/_returnDetails.scss	Adds styling for the cancelled status badge on return details.
assets/scss/components/stencil/account/_account.scss	Adds styling for the cancelled status badge on the account returns list.

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[jpajar]

@denis-bc this is pre-existing styling so I didn't touch them, perhaps @bc-bryan can confirm since he initially worked on the styling for the badges on these pages?