The Radix NavigationMenu uses a single shared viewport centered under
the full nav list. Opening a right-side submenu (Analyzer, Admin)
positioned the dropdown panel far to the left, so moving the mouse to
reach it crossed other triggers and closed it mid-way.
Switch all items-with-children to DropdownMenu, which positions each
panel directly under its own trigger. Keeps the same visual style
(navigationMenuTriggerStyle, ChevronDown, item layout with icon +
description) and active-state highlighting.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>