fix: Update Transformation Tooltip gizmo to have transparent background property so hit registration matches highlighting

[Acissathar]

PR Details

The hover highlight and tooltip for the transform gizmos are not consistent as the tooltip will only occur when directly over the actual icon itself, while the highlight occurs when on the button.

Example:

The tooltip was attached to the Border element inside the DataTemplate, causing a mismatch where hovering over the ListBoxItem's padding area triggered the highlight but didn't show the tooltip. This change moves the tooltip from the Border element into the ListBoxItem container style so that it applies to the entire item.

With change:

Related Issue

#3054

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.