Fix nested drag and drop in navigation menu by connecting all cdkDropLists

[Copilot]

Nested dropdowns in the navigation menu couldn't accept dragged items because cdkDropList containers were only partially connected. Angular CDK requires all interacting drop lists to be mutually aware through cdkDropListConnectedTo for nested drag-drop to function.

Changes

Component (navigation-menu-page.component.ts)

• Added allConnectedDropListIds getter that aggregates all drop list IDs (template menu, actual menu, and dynamic dropdown IDs)

Template (navigation-menu-page.component.html)

• Updated all three cdkDropListConnectedTo bindings to reference allConnectedDropListIds instead of partial ID arrays

// Before: each drop list had limited connections
[cdkDropListConnectedTo]="['mainMenu']"  // actualMenuList
[cdkDropListConnectedTo]="['mainMenu']"  // dropdown children

// After: all drop lists share complete connection list
get allConnectedDropListIds(): string[] {
  return ['mainMenu', 'actualMenuList', ...this.connectedDropdownIds];
}
[cdkDropListConnectedTo]="allConnectedDropListIds"  // everywhere

This enables dragging items from the actual menu into dropdown children and between dropdown children, which were previously blocked.

Original prompt

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This section details on the original issue you should resolve

<issue_title>nested drag and drop as the dropdown is in navigation does not work</issue_title>
<issue_description>In order for the nested drop target to work in eform-client/src/app/modules/advanced/modules/navigation-menu/components/navigation-menu-page, it needs to follow this answer https://stackoverflow.com/a/67337935/2144807</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes nested drag and drop as the dropdown is in navigation does not work #7278

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