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/components/admin/userDetail/InfoTab.tsx

@@ -9,6 +9,7 @@ import type {
   UserSubscriptionInfo,
 } from '../../../api/adminUsers';
 import type { PromoGroup } from '../../../api/promocodes';
+import { ServerIcon } from '@/components/icons';
 
 // ──────────────────────────────────────────────────────────────────
 // Local status badge (parent has its own — duplicating here to keep
@@ -260,19 +261,7 @@ export function InfoTab(props: InfoTabProps) {
                     {t('admin.users.detail.lastNode')}
                   </div>
                   <div className="flex items-center gap-2 text-sm text-dark-100">
-                    <svg
-                      className="h-4 w-4 shrink-0 text-dark-400"
-                      fill="none"
-                      viewBox="0 0 24 24"
-                      stroke="currentColor"
-                      strokeWidth={2}
-                    >
-                      <path
-                        strokeLinecap="round"
-                        strokeLinejoin="round"
-                        d="M5.25 14.25h13.5m-13.5 0a3 3 0 01-3-3m3 3a3 3 0 100 6h13.5a3 3 0 100-6m-16.5-3a3 3 0 013-3h13.5a3 3 0 013 3m-19.5 0a4.5 4.5 0 01.9-2.7L5.737 5.1a3.375 3.375 0 012.7-1.35h7.126c1.062 0 2.062.5 2.7 1.35l2.587 3.45a4.5 4.5 0 01.9 2.7m0 0a3 3 0 01-3 3m0 3h.008v.008h-.008v-.008zm0-6h.008v.008h-.008v-.008zm-3 6h.008v.008h-.008v-.008zm0-6h.008v.008h-.008v-.008z"
-                      />
-                    </svg>
+                    <ServerIcon className="h-4 w-4 shrink-0 text-dark-400" />
                     {panelInfo.last_connected_node_name}
                   </div>
                 </div>