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/click-to-call-button.tsx

@@ -1,6 +1,10 @@
+import type { FC } from 'react';
 import { useState } from 'react';
-import { Phone01 } from '@untitledui/icons';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faPhone } from '@fortawesome/pro-duotone-svg-icons';
 import { useSetAtom } from 'jotai';
+
+const Phone01: FC<{ className?: string }> = ({ className }) => <FontAwesomeIcon icon={faPhone} className={className} />;
 import { Button } from '@/components/base/buttons/button';
 import { useSip } from '@/providers/sip-provider';
 import { sipCallStateAtom, sipCallerNumberAtom, sipCallUcidAtom } from '@/state/sip-state';