refactor(cabinet): migrate inline SVG icons to the central react-icons set

Audit-driven sweep: replaced 168 hand-written inline <svg> icons across 77
files with the central Phosphor (react-icons/pi) components from
@/components/icons, preserving each icon's size classes and colour (dynamic
stroke colours via the parent's currentColor, RefreshIcon's spinning state,
conditional rotate-180 chevrons).

Verified: tsc + vite build + eslint clean; an adversarial diff review of all
changed files found the replacements correct (70 files clean, 0 blockers).
Remaining inline <svg> dropped from 262 to ~95 — the survivors are legitimate
non-icons (brand/provider logos, loading spinners & framer-motion animations,
charts/sparklines, background decoration) plus a few ambiguous glyphs.

src/pages/AdminPromoOfferSend.tsx

@@ -19,6 +19,7 @@ import {
   UserIcon,
   SearchIcon,
   CloseIcon,
+  XIcon,
 } from '@/components/icons';
 
 const getOfferTypeIcon = (offerType: string): string => {
@@ -188,25 +189,9 @@ export default function AdminPromoOfferSend() {
             }`}
           >
             {result.isSuccess ? (
-              <svg
-                className="h-8 w-8 text-success-400"
-                fill="none"
-                viewBox="0 0 24 24"
-                stroke="currentColor"
-                strokeWidth={2}
-              >
-                <path strokeLinecap="round" strokeLinejoin="round" d="M4.5 12.75l6 6 9-13.5" />
-              </svg>
+              <CheckIcon className="h-8 w-8 text-success-400" />
             ) : (
-              <svg
-                className="h-8 w-8 text-error-400"
-                fill="none"
-                viewBox="0 0 24 24"
-                stroke="currentColor"
-                strokeWidth={2}
-              >
-                <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
-              </svg>
+              <XIcon className="h-8 w-8 text-error-400" />
             )}
           </div>
           <h3 className="mb-2 text-lg font-semibold text-dark-100">{result.title}</h3>