Add Summary2 support for AttachmentList

### Description

To display an attachment list in a summary layout, you'll have to use the component directly. When using the Summary2 component with "target.type": "page", the AttachmentList component can only be placed before or after the entire page. To position it within the page, you need separate Summary2 components with "target.type": "component" for each targeted component. This approach increases the risk of errors and leads to redundant code.

### Additional Information

_No response_

Start by locating the Summary2 and AttachmentList component implementations and their existing tests. Trace how a Summary2 with target.type "page" places AttachmentList, then define done as allowing the list to appear within the targeted page without separate component-level Summary2 instances.

Written by the indexing model from the issue text.