Add PageShell — collapsed sidebar strip on Dashboard and all admin pages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/AdminMonitor.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useRef, useState } from 'react'
 import { ArrowUpCircle, Activity, ScrollText, RefreshCw, TerminalSquare, HardDrive, ChevronDown, ChevronRight, Play } from 'lucide-react'
-import { Sidebar } from '../components/Sidebar'
+import { PageShell } from '../components/PageShell'
 import type { User } from '../types'
 
 interface AppStatus {
@@ -238,8 +238,7 @@ export function AdminMonitor({ user }: { user: User }) {
   ]
 
   return (
-    <div style={{ display: 'flex', height: '100dvh' }}>
-      <Sidebar user={user} />
+    <PageShell user={user} padding="2rem">
       <div style={{ flex: 1, display: 'flex', flexDirection: 'column', overflow: 'hidden' }}>
 
         {/* Tab bar */}
@@ -718,6 +717,6 @@ export function AdminMonitor({ user }: { user: User }) {
         )}
 
       </div>
-    </div>
+    </PageShell>
   )
 }