Summary\nEnsure the tree panel context menu options for Copy and Edit DAG raise the correct events, show notifications, wait for parent completion, and refresh the panel once finished.\n\n## Acceptance Criteria\n- [ ] Copy action raises embed-tree-copy, emits loading toast, waits for completion, and refreshes tree data\n- [ ] Edit DAG action raises embed-tree-edit-dag, emits loading toast, waits for completion, and refreshes tree data\n- [ ] Actions handle error responses gracefully\n- [ ] Cypress coverage verifies event emission and refresh behavior\n\n## Implementation Plan\n- Review current menu item implementations in src/js/panel.tree.js\n- Add waiting + refresh logic leveraging existing event utilities\n- Provide toast notifications via panelUtilsNs.showNotification\n- Add Cypress test updates for both menu items
