Add Spright work item square list cog icon

[vivinkrishna-ni]

Pull Request

🤨 Rationale

This PR adds a new Spright work-item icon, spright-icon-work-item-square-list-cog, mapped to Nimble’s square-list-cog icon so work order items have a dedicated visual metaphor consistent with other work-item types.

The icon color uses the newly added theme-aware work-order border token from PR A, keeping behavior aligned with the existing Spright work-item icon pattern introduced in PR 2861.

Mockup link: https://www.figma.com/design/Hc3CF8ZIrKo8R8pXGiATfx/Work-items-in-SystemLink?node-id=5745-15570&t=c3jrh5oG1XN7LP46-0

Depends on token PR: #2971

👩‍💻 Implementation

• Added a new Spright icon component for work orders spright-icon-work-item-square-list-cog
• Added icon styling to use the theme-aware work-order color token so the icon automatically adapts by theme.
• Added icon metadata tags for discoverability in icon catalog/story usage.
• Added Angular standalone wrapper directive and secondary entry point

🧪 Testing

• Verified with the storybook build

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

@jattasNI bypassing for straightforward change aligned to existing patterns