fix(cabinet-icons): correct two mismatched glyphs from the svg migration

A personal glyph-by-glyph re-review of the migration (the "steering wheel"
guard) found two wrong matches:
- MaintenanceScreen: a wrench/maintenance svg had been mapped to AdjustmentsIcon
  (sliders) → use a proper WrenchIcon (PiWrench).
- InstallationGuide tutorial button: an open-book svg had been mapped to
  DocumentIcon (file) → use BookOpenIcon (PiBookOpen).

Add WrenchIcon and BookOpenIcon to the central barrel. All other replacements
were verified correct (paper-plane→Send, server→HardDrives, warning-triangle→
Warning, etc.).

src/components/blocking/MaintenanceScreen.tsx

@@ -1,7 +1,7 @@
 import { useTranslation } from 'react-i18next';
 import { useBlockingStore } from '../../store/blocking';
 import { useFocusTrap } from '../../hooks/useFocusTrap';
-import { AdjustmentsIcon } from '@/components/icons';
+import { WrenchIcon } from '@/components/icons';
 
 export default function MaintenanceScreen() {
   const { t } = useTranslation();
@@ -21,7 +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">
-            <AdjustmentsIcon className="h-12 w-12 text-warning-500" />
+            <WrenchIcon className="h-12 w-12 text-warning-500" />
           </div>
         </div>