refactor: migrate all icons from Untitled UI to FontAwesome Pro Duotone

Replace all @untitledui/icons imports across 55 files with equivalent
@fortawesome/pro-duotone-svg-icons icons, using FontAwesomeIcon wrappers
(FC<{ className?: string }>) for prop-based usage and inline replacements
for direct JSX usage. Drops unsupported Untitled UI-specific props
(strokeWidth, numeric size). TypeScript compiles clean with no errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/call-desk/call-simulator.tsx

@@ -1,4 +1,5 @@
-import { PhoneCall01 } from '@untitledui/icons';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faPhoneArrowUpRight } from '@fortawesome/pro-duotone-svg-icons';
 import { cx } from '@/utils/cx';
 
 interface CallSimulatorProps {
@@ -19,7 +20,7 @@ export const CallSimulator = ({ onSimulate, isCallActive }: CallSimulatorProps)
                     : 'cursor-pointer bg-brand-solid hover:bg-brand-solid_hover [&:hover_svg]:animate-[ring-shake_0.5s_ease-in-out]',
             )}
         >
-            <PhoneCall01 className="size-5 shrink-0" />
+            <FontAwesomeIcon icon={faPhoneArrowUpRight} className="size-5 shrink-0" />
             {isCallActive ? 'Call in progress...' : 'Simulate Incoming Call'}
         </button>
     );