Fix: Consistent background across pages

Ensure all pages share the same background and make the map fullscreen.

src/pages/SystemView.tsx

@@ -165,7 +165,7 @@ export const SystemView = () => {
   ];
 
   return (
-    <div className="h-screen bg-gradient-to-br from-slate-900 via-slate-800 to-slate-900 overflow-hidden">
+    <div className="h-screen w-screen bg-gradient-to-br from-slate-900 via-slate-800 to-slate-900 overflow-hidden">
       <div className="h-full flex flex-col">
         <Header title={`System: ${system}`} breadcrumbs={breadcrumbs} />