feat(ui): migrate home page to design system Monitor archetype

Wrap in PageShell + PageHeader + MonitorLayout. Replace bespoke hero
stat row with KpiRow + 4 KpiCards (profiles, cliproxy, accounts, health
with status-derived tone). AuthMonitor and ErrorLogsMonitor become
MonitorCard children; the 'logs moved' callout becomes a MonitorCard.

Pure layout migration -- behavior preserved (navigation, configuration
warning Alert, hooks unchanged). Hero punch retained via tone-coded KPI
cards. LOC: 208 -> 173.

ui/src/pages/home.tsx

@@ -1,68 +1,38 @@
 import { useNavigate } from 'react-router-dom';
-import { HeroSection } from '@/components/layout/hero-section';
+import { useTranslation } from 'react-i18next';
+import {
+  ActivityIcon,
+  AlertTriangle,
+  ArrowRight,
+  KeyIcon,
+  ScrollText,
+  ShieldCheck,
+  UsersIcon,
+  Zap,
+} from 'lucide-react';
 import { AuthMonitor } from '@/components/monitoring/auth-monitor';
 import { ErrorLogsMonitor } from '@/components/error-logs-monitor';
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
+import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import { Skeleton } from '@/components/ui/skeleton';
-import { Key, Zap, Users, Activity, AlertTriangle, ArrowRight, ScrollText } from 'lucide-react';
 import { useOverview } from '@/hooks/use-overview';
 import { useSharedSummary } from '@/hooks/use-shared';
-import { cn } from '@/lib/utils';
-import type { LucideIcon } from 'lucide-react';
-import { useTranslation } from 'react-i18next';
+import { PageShell, PageHeader } from '@/components/page-shell';
+import {
+  MonitorLayout,
+  KpiRow,
+  KpiCard,
+  MonitorGrid,
+  MonitorCard,
+} from '@/components/monitor-layout';
 
-const HEALTH_VARIANTS = {
-  ok: 'success',
+const HEALTH_TONE = {
+  ok: 'positive',
   warning: 'warning',
-  error: 'error',
+  error: 'negative',
 } as const;
 
-type StatVariant = 'default' | 'success' | 'warning' | 'error' | 'accent';
-
-const variantStyles: Record<StatVariant, { iconBg: string; iconColor: string }> = {
-  default: { iconBg: 'bg-muted', iconColor: 'text-muted-foreground' },
-  success: { iconBg: 'bg-green-600/15', iconColor: 'text-green-700 dark:text-green-500' },
-  warning: { iconBg: 'bg-amber-500/15', iconColor: 'text-amber-700 dark:text-amber-400' },
-  error: { iconBg: 'bg-red-600/15', iconColor: 'text-red-700 dark:text-red-500' },
-  accent: { iconBg: 'bg-accent/15', iconColor: 'text-accent' },
-};
-
-function InlineStat({
-  title,
-  value,
-  icon: Icon,
-  variant = 'default',
-  onClick,
-}: {
-  title: string;
-  value: number | string;
-  icon: LucideIcon;
-  variant?: StatVariant;
-  onClick?: () => void;
-}) {
-  const styles = variantStyles[variant];
-
-  return (
-    <button
-      onClick={onClick}
-      className={cn(
-        'flex items-center gap-3 px-4 py-2.5 rounded-lg border bg-card/50',
-        'transition-all hover:bg-card hover:shadow-sm hover:-translate-y-0.5',
-        'active:scale-[0.98]'
-      )}
-    >
-      <div className={cn('flex items-center justify-center w-9 h-9 rounded-md', styles.iconBg)}>
-        <Icon className={cn('w-4 h-4', styles.iconColor)} />
-      </div>
-      <div className="text-left">
-        <p className="text-[10px] text-muted-foreground uppercase tracking-wider">{title}</p>
-        <p className={cn('text-lg font-bold font-mono leading-tight', styles.iconColor)}>{value}</p>
-      </div>
-    </button>
-  );
-}
-
 export function HomePage() {
   const { t } = useTranslation();
   const navigate = useNavigate();
@@ -70,139 +40,134 @@ export function HomePage() {
   const { data: shared, isLoading: isSharedLoading } = useSharedSummary();
 
   if (isOverviewLoading || isSharedLoading) {
-    return (
-      <div className="p-6 space-y-6">
-        {/* Hero Row Skeleton */}
-        <div className="rounded-xl border p-6 flex items-center justify-between">
-          <div className="flex items-center gap-4">
-            <Skeleton className="h-12 w-12 rounded-lg" />
-            <div>
-              <Skeleton className="h-7 w-[180px] mb-2" />
-              <Skeleton className="h-4 w-[220px]" />
-            </div>
-          </div>
-          <div className="flex items-center gap-3">
-            {[1, 2, 3, 4].map((i) => (
-              <Skeleton key={i} className="h-14 w-28 rounded-lg" />
-            ))}
-          </div>
-        </div>
-
-        {/* Auth Monitor Skeleton */}
-        <div className="border rounded-xl overflow-hidden">
-          <div className="px-4 py-2.5 border-b flex items-center justify-between">
-            <Skeleton className="h-4 w-32" />
-            <Skeleton className="h-4 w-20" />
-          </div>
-          <div className="px-4 py-3 border-b">
-            <Skeleton className="h-2 w-full rounded-full" />
-          </div>
-          {[1, 2, 3].map((i) => (
-            <div key={i} className="px-4 py-2.5 flex items-center gap-3 border-b last:border-b-0">
-              <Skeleton className="w-2.5 h-2.5 rounded-full" />
-              <Skeleton className="h-4 flex-1" />
-              <Skeleton className="h-1.5 w-24 rounded-full" />
-              <Skeleton className="h-4 w-16" />
-            </div>
-          ))}
-        </div>
-      </div>
-    );
+    return <HomeLoadingSkeleton />;
   }
 
-  const healthVariant = overview?.health
-    ? HEALTH_VARIANTS[overview.health.status as keyof typeof HEALTH_VARIANTS]
-    : undefined;
+  const healthTone = overview?.health
+    ? HEALTH_TONE[overview.health.status as keyof typeof HEALTH_TONE]
+    : 'default';
 
   return (
-    <div className="p-6 space-y-6">
-      {/* Hero Row: Logo/Title + Inline Stats */}
-      <div className="relative overflow-hidden rounded-xl border bg-gradient-to-br from-background via-background to-muted/30">
-        {/* Subtle background pattern */}
-        <div className="absolute inset-0 opacity-[0.03] pointer-events-none">
-          <div
-            className="absolute inset-0"
-            style={{
-              backgroundImage: `radial-gradient(circle at 1px 1px, currentColor 1px, transparent 0)`,
-              backgroundSize: '24px 24px',
-            }}
-          />
-        </div>
-
-        {/* Single Row Layout */}
-        <div className="relative p-6 flex flex-col lg:flex-row lg:items-center lg:justify-between gap-4">
-          {/* Left: Logo + Title */}
-          <HeroSection version={overview?.version} />
-
-          {/* Right: Inline Stats */}
-          <div className="flex flex-wrap items-center gap-3">
-            <InlineStat
-              title={t('home.profiles')}
+    <PageShell>
+      <PageHeader
+        title={t('heroSection.title')}
+        description={t('heroSection.subtitle')}
+        status={
+          overview?.version && (
+            <Badge variant="outline" className="font-mono text-xs">
+              v{overview.version}
+            </Badge>
+          )
+        }
+      />
+      <MonitorLayout
+        kpis={
+          <KpiRow>
+            <KpiCard
+              label={t('home.profiles')}
               value={overview?.profiles ?? 0}
-              icon={Key}
-              variant="accent"
-              onClick={() => navigate('/providers')}
+              icon={<KeyIcon className="size-4" />}
             />
-            <InlineStat
-              title={t('home.cliproxy')}
+            <KpiCard
+              label={t('home.cliproxy')}
               value={overview?.cliproxy ?? 0}
-              icon={Zap}
-              variant="accent"
-              onClick={() => navigate('/cliproxy')}
+              icon={<Zap className="size-4" />}
             />
-            <InlineStat
-              title={t('home.accounts')}
+            <KpiCard
+              label={t('home.accounts')}
               value={overview?.accounts ?? 0}
-              icon={Users}
-              variant="default"
-              onClick={() => navigate('/accounts')}
+              icon={<UsersIcon className="size-4" />}
             />
-            <InlineStat
-              title={t('home.health')}
-              value={overview?.health ? `${overview.health.passed}/${overview.health.total}` : '-'}
-              icon={Activity}
-              variant={healthVariant}
-              onClick={() => navigate('/health')}
+            <KpiCard
+              label={t('home.health')}
+              value={overview?.health ? `${overview.health.passed}/${overview.health.total}` : '—'}
+              tone={healthTone}
+              icon={<ActivityIcon className="size-4" />}
             />
-          </div>
-        </div>
-      </div>
+          </KpiRow>
+        }
+      >
+        {shared?.symlinkStatus && !shared.symlinkStatus.valid && (
+          <Alert variant="warning">
+            <AlertTriangle className="h-4 w-4" />
+            <AlertTitle>{t('home.configurationRequired')}</AlertTitle>
+            <AlertDescription>{shared.symlinkStatus.message}</AlertDescription>
+          </Alert>
+        )}
 
-      {/* Configuration Warning */}
-      {shared?.symlinkStatus && !shared.symlinkStatus.valid && (
-        <Alert variant="warning">
-          <AlertTriangle className="h-4 w-4" />
-          <AlertTitle>{t('home.configurationRequired')}</AlertTitle>
-          <AlertDescription>{shared.symlinkStatus.message}</AlertDescription>
-        </Alert>
-      )}
+        <MonitorGrid>
+          {/* Live account monitor — primary viz */}
+          <MonitorCard
+            span={12}
+            title={
+              <span className="flex items-center gap-2">
+                <ShieldCheck className="size-4" />
+                Live account monitor
+              </span>
+            }
+          >
+            <AuthMonitor />
+          </MonitorCard>
 
-      {/* Auth Monitor */}
-      <AuthMonitor />
-
-      <div className="rounded-xl border bg-card/70 p-5">
-        <div className="flex flex-col gap-4 md:flex-row md:items-center md:justify-between">
-          <div className="flex items-start gap-3">
-            <div className="rounded-xl bg-muted p-2.5">
-              <ScrollText className="h-5 w-5 text-muted-foreground" />
+          {/* Logs callout */}
+          <MonitorCard span={12}>
+            <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+              <div className="flex items-start gap-3">
+                <div className="rounded-xl bg-muted p-2.5">
+                  <ScrollText className="h-5 w-5 text-muted-foreground" />
+                </div>
+                <div className="space-y-1">
+                  <h2 className="text-base font-semibold">{t('homePageV2.logsMoved')}</h2>
+                  <p className="max-w-2xl text-sm text-muted-foreground">
+                    Use the unified logs page for source-level filtering, structured entry
+                    inspection, and retention policy edits without crowding the home dashboard.
+                  </p>
+                </div>
+              </div>
+              <Button variant="outline" className="gap-2" onClick={() => navigate('/logs')}>
+                Open logs
+                <ArrowRight className="h-4 w-4" />
+              </Button>
             </div>
-            <div className="space-y-1">
-              <h2 className="text-lg font-semibold">{t('homePageV2.logsMoved')}</h2>
-              <p className="max-w-2xl text-sm text-muted-foreground">
-                Use the unified logs page for source-level filtering, structured entry inspection,
-                and retention policy edits without crowding the home dashboard.
-              </p>
-            </div>
-          </div>
-          <Button variant="outline" className="gap-2" onClick={() => navigate('/logs')}>
-            {/* TODO i18n: missing key for "Open logs" */}
-            Open logs
-            <ArrowRight className="h-4 w-4" />
-          </Button>
-        </div>
-      </div>
+          </MonitorCard>
 
-      <ErrorLogsMonitor />
-    </div>
+          {/* Recent errors */}
+          <MonitorCard
+            span={12}
+            title={
+              <span className="flex items-center gap-2">
+                <AlertTriangle className="size-4" />
+                Recent errors
+              </span>
+            }
+          >
+            <ErrorLogsMonitor />
+          </MonitorCard>
+        </MonitorGrid>
+      </MonitorLayout>
+    </PageShell>
+  );
+}
+
+function HomeLoadingSkeleton() {
+  return (
+    <PageShell>
+      <PageHeader title={<Skeleton className="h-6 w-40" />} />
+      <MonitorLayout
+        kpis={
+          <KpiRow>
+            {[1, 2, 3, 4].map((i) => (
+              <Skeleton key={i} className="h-20 rounded-xl" />
+            ))}
+          </KpiRow>
+        }
+      >
+        <MonitorGrid>
+          <MonitorCard span={12}>
+            <Skeleton className="h-48 w-full rounded" />
+          </MonitorCard>
+        </MonitorGrid>
+      </MonitorLayout>
+    </PageShell>
   );
 }