fix(ui): scroll to top when switching device sidebar tabs

Wraps setActiveTab to also scroll #main-content to top. Prevents
stale scroll position when navigating from a long tab (e.g. Firewall)
to a short one (e.g. SNMP).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/routes/_authenticated/tenants/$tenantId/devices/$deviceId.tsx

@@ -302,7 +302,11 @@ function DeviceDetailPage() {
   const queryClient = useQueryClient()
   const { user } = useAuth()
   const [showCreds, setShowCreds] = useState(false)
-  const [activeTab, setActiveTab] = useState('overview')
+  const [activeTab, setActiveTabRaw] = useState('overview')
+  const setActiveTab = (tab: string) => {
+    setActiveTabRaw(tab)
+    document.getElementById('main-content')?.scrollTo(0, 0)
+  }
   const [editOpen, setEditOpen] = useState(false)
   const { mode, toggleMode } = useSimpleConfigMode(deviceId)