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/icons/extended-icons.tsx

@@ -1,5 +1,7 @@
 import {
   PiSlidersHorizontal,
+  PiWrench,
+  PiBookOpen,
   PiHeadset,
   PiArrowDown,
   PiArrowRight,
@@ -90,6 +92,14 @@ export const AdjustmentsIcon = ({ className }: IconProps) => (
   <PiSlidersHorizontal className={cn('h-5 w-5', className)} />
 );
 
+export const WrenchIcon = ({ className }: IconProps) => (
+  <PiWrench className={cn('h-5 w-5', className)} />
+);
+
+export const BookOpenIcon = ({ className }: IconProps) => (
+  <PiBookOpen className={cn('h-5 w-5', className)} />
+);
+
 export const AgentIcon = ({ className }: IconProps) => (
   <PiHeadset className={cn('h-5 w-5', className)} />
 );