Left-facing foldout arrow is shown after the label when Graph Toolkit variables are collapsed

Steps to reproduce:

1. Create a new URP project
2. Open any graph or the attached "Sample Graph.cs"
3. Add any variable to the Blackboard
4. Observe the arrow next to the variable

Actual results: The collapsed row shows a left-facing foldout/expand arrow

Expected results: A collapsed variable shows a foldout arrow that clearly indicates it can be expanded, such as a right-facing arrow, matching common Unity Editor foldout behavior

Reproducible with versions: 6000.4.3f1, 6000.5.0b4, 6000.6.0a2

Tested on (OS): macOS 26.4, Ubuntu 24.04

Notes:

• The same behavior is seen across whole Graph Toolkit, not only in the Blackboard
• This appears to be a UX consistency issue as elsewhere in the Unity Editor, foldouts and expand/collapse states are typically shown with a leading chevron, usually right-facing when collapsed and down-facing when expanded
• A left-facing arrow can read more like a collapse or back/navigation than an expand/collapse control