style(cabinet-icons): use regular Phosphor weight and switch wheel to dice

- Drop the Duotone variants (their translucent secondary fill looked murky on
  the dark theme) in favour of the clean regular weight across all icons
- WheelIcon: PiSteeringWheel → PiDiceFive (a steering wheel made no sense for
  the fortune-wheel feature)

src/components/admin/MenuEditorTab.tsx

@@ -18,7 +18,7 @@ import {
   verticalListSortingStrategy,
 } from '@dnd-kit/sortable';
 import { CSS } from '@dnd-kit/utilities';
-import { PiCaretDownDuotone } from 'react-icons/pi';
+import { PiCaretDown } from 'react-icons/pi';
 import {
   GripIcon,
   TrashIcon,
@@ -41,9 +41,7 @@ import { useNotify } from '../../platform/hooks/useNotify';
 import { useNativeDialog } from '../../platform/hooks/useNativeDialog';
 
 const ChevronIcon = ({ expanded }: { expanded: boolean }) => (
-  <PiCaretDownDuotone
-    className={`h-3.5 w-3.5 transition-transform ${expanded ? 'rotate-180' : ''}`}
-  />
+  <PiCaretDown className={`h-3.5 w-3.5 transition-transform ${expanded ? 'rotate-180' : ''}`} />
 );
 
 function generateId(): string {