Project Auditor section headers require a double-click to expand/collapse, inconsistent with the single-click arrow pattern used everywhere else in the Editor (Hierarchy, Project window)

Steps to reproduce:

1. Create or open a Unity project
2. Install Project Auditor package if it is not installed
3. Open Project Auditor (Window -> Analysis ->Project Auditor )
4. Click once on the arrow next to a section header (e.g. "Optimization" or "Upgrade")
5. Click once on the section header text itself (not the arrow)

Actual results: Clicking the arrow expands/collapses the section on a single click, as expected. Clicking the header text does nothing on a single click - it requires a double-click to expand/collapse

Expected results: Clicking the header text should expand/collapse on a single click, consistent with the pattern used in the Hierarchy and Project windows (and elsewhere in the Editor): click the arrow to expand/collapse, click the label to select - no double-click needed anywhere

Reproducible with versions:  6000.6.0b8, 6000.7.0a4

Tested on (OS): MacBook Pro - Tahoe 26.6

Notes: This double-click requirement was introduced deliberately by [Internal link] ("Project Auditor - Double Click doesn't expand/collapse areas," Closed, Fixed), which added double-click support based on the assumption that single-click on the header needed to stay reserved for selection (to avoid conflicting with a separate select action)