Space is missing between StyleSheet and owning document name when viewing inherited StyleSheets in context mode

Steps to reproduce:

1. Create a new project
2. Create a new USS file (Create > UI Toolkit > Style Sheet (USS))
3. Create two UI Documents, name them "parent" and "child" (Create > UI Toolkit > UI Document (USS))
4. Open each Document in UI Builder
5. Click "+" > Add Existing USS and add previously created USS (on both Documents)
6. Open the "parent" in UI Builder and navigate to Project tab in Library tab
7. Expand the Assets foldout to find "child.uxml" and drag it into Hierarchy
8. Right-click on the "TemplateContainer child.uxml" in the UI Builder Hierarchy
9. Select "Open Instance In Context"
10. Observe under StyleSheets the "test.uss parent.uxml" text

Actual results: The stylesheet name and owning document name run together with no separator, e.g. "test.ussparent.uxml"

Expected results: The stylesheet name and owning document name are separated by a visual space, e.g. "test.uss parent.uxml"

Reproducible with versions: 6000.3.20f1, 6000.4.0a1, 6000.5.5f1, 6000.6.0b5, 6000.7.0a3

Not reproducible with versions: 6000.0.80f1, 6000.3.0a6

Tested on (OS): macOS 26.5