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/blocking/MaintenanceScreen.tsx

@@ -1,6 +1,7 @@
 import { useTranslation } from 'react-i18next';
 import { useBlockingStore } from '../../store/blocking';
 import { useFocusTrap } from '../../hooks/useFocusTrap';
+import { AdjustmentsIcon } from '@/components/icons';
 
 export default function MaintenanceScreen() {
   const { t } = useTranslation();
@@ -20,19 +21,7 @@ export default function MaintenanceScreen() {
         {/* Icon */}
         <div className="mb-8">
           <div className="mx-auto flex h-24 w-24 items-center justify-center rounded-full bg-dark-800">
-            <svg
-              className="h-12 w-12 text-warning-500"
-              fill="none"
-              viewBox="0 0 24 24"
-              stroke="currentColor"
-            >
-              <path
-                strokeLinecap="round"
-                strokeLinejoin="round"
-                strokeWidth={1.5}
-                d="M11.42 15.17L17.25 21A2.652 2.652 0 0021 17.25l-5.877-5.877M11.42 15.17l2.496-3.03c.317-.384.74-.626 1.208-.766M11.42 15.17l-4.655 5.653a2.548 2.548 0 11-3.586-3.586l6.837-5.63m5.108-.233c.55-.164 1.163-.188 1.743-.14a4.5 4.5 0 004.486-6.336l-3.276 3.277a3.004 3.004 0 01-2.25-2.25l3.276-3.276a4.5 4.5 0 00-6.336 4.486c.091 1.076-.071 2.264-.904 2.95l-.102.085m-1.745 1.437L5.909 7.5H4.5L2.25 3.75l1.5-1.5L7.5 4.5v1.409l4.26 4.26m-1.745 1.437l1.745-1.437m6.615 8.206L15.75 15.75M4.867 19.125h.008v.008h-.008v-.008z"
-              />
-            </svg>
+            <AdjustmentsIcon className="h-12 w-12 text-warning-500" />
           </div>
         </div>