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/AdminPartnerDetail.tsx

@@ -4,6 +4,7 @@ import { useTranslation } from 'react-i18next';
 import { partnerApi } from '../api/partners';
 import { AdminBackButton } from '../components/admin';
 import { useCurrency } from '../hooks/useCurrency';
+import { XIcon } from '@/components/icons';
 
 // Status badge config — keys must match backend PartnerStatus enum values
 const statusConfig: Record<string, { labelKey: string; color: string; bgColor: string }> = {
@@ -259,19 +260,7 @@ export default function AdminPartnerDetail() {
                         className="rounded p-1 text-dark-500 transition-colors hover:bg-error-500/10 hover:text-error-400"
                         title={t('admin.partnerDetail.campaigns.unassign')}
                       >
-                        <svg
-                          className="h-4 w-4"
-                          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-4 w-4" />
                       </button>
                     </div>
                   </div>