Library theming: Update Drag & drop component in design kit

[andrew-ronaldson]

Apply unified theme standards to the Drag & drop component in the PatternFly design kit. Update Figma tokens, styles, and make sure all states and documentation reflect the new visual language.

Deliverables:

• Update tokens

• Include new variants

• Update branded icons

---

Jira Issue: PF-3675

[patternfly-jira-sync]

Closed via Jira sync - Jira issue PF-3675 was closed.