src/App.tsx

@@ -1,5 +1,11 @@
 import { useEffect, useState } from "react";
 import type { DashboardRuntimeState } from "$lib/server/dashboard";
+import {
+  DashboardFrame,
+  SystemState,
+  dashboardDocumentToUiDashboard,
+  type UiSeverity,
+} from "$lib/ui";
 
 const loadingDashboardState: DashboardRuntimeState = {
   state: "loading",
@@ -14,14 +20,31 @@ export function AppStateView({
   dashboard: DashboardRuntimeState;
 }) {
   if (dashboard.state === "ready") {
-    return <main>{dashboard.document.metadata.title}</main>;
+    return (
+      <DashboardFrame
+        dashboard={dashboardDocumentToUiDashboard(dashboard.document)}
+      />
+    );
   }
 
+  const detail = `${dashboard.subtitle}: ${dashboard.message}`;
+  const errors = dashboard.state === "invalid" ? dashboard.errors : [];
+
   return (
     <main className="state-shell" data-dashboard-state={dashboard.state}>
-      <h1>{dashboard.title}</h1>
-      <p>{dashboard.subtitle}</p>
-      <p>{dashboard.message}</p>
+      <SystemState
+        title={dashboard.title}
+        detail={detail}
+        severity={stateSeverity(dashboard.state)}
+        icon={stateIcon(dashboard.state)}
+      />
+      {errors.length ? (
+        <ul aria-label="Validation errors">
+          {errors.map((error) => (
+            <li key={error}>{error}</li>
+          ))}
+        </ul>
+      ) : null}
     </main>
   );
 }
@@ -69,3 +92,15 @@ export default function App() {
 
   return <AppStateView dashboard={dashboard} />;
 }
+
+function stateSeverity(state: DashboardRuntimeState["state"]): UiSeverity {
+  if (state === "invalid") return "danger";
+  if (state === "loading") return "loading";
+  return "stale";
+}
+
+function stateIcon(state: DashboardRuntimeState["state"]): string {
+  if (state === "invalid") return "mdi:file-alert-outline";
+  if (state === "loading") return "mdi:progress-clock";
+  return "mdi:tray";
+}

src/app.css

@@ -133,6 +133,27 @@ a {
   color: inherit;
 }
 
+.state-shell {
+  display: grid;
+  min-height: 100vh;
+  align-content: center;
+  gap: var(--ui-space-3);
+  padding: var(--ui-space-4);
+}
+
+.state-shell ul {
+  display: grid;
+  max-width: 56rem;
+  gap: var(--ui-space-2);
+  margin: 0;
+  border: var(--ui-border);
+  background: rgba(6, 8, 7, 0.82);
+  color: var(--ui-color-muted);
+  font-size: 0.76rem;
+  list-style-position: inside;
+  padding: var(--ui-space-3);
+}
+
 @media (prefers-reduced-motion: reduce) {
   *,
   *::before,

src/page.test.tsx

@@ -0,0 +1,73 @@
+import { renderToString } from "react-dom/server";
+import { describe, expect, test } from "vitest";
+import { genericDashboardFixture } from "$lib/model/fixtures/generic";
+import { AppStateView } from "./App";
+
+describe("home page model renderer", () => {
+  test("renders the active dashboard model from the runtime state", () => {
+    const body = renderToString(
+      <AppStateView
+        dashboard={{
+          state: "ready",
+          document: genericDashboardFixture,
+          schemaVersion: "dashboard.v1",
+          currentRevisionId: "revision-1234567890",
+        }}
+      />,
+    );
+
+    expect(body).toContain("Operations Console");
+    expect(body).toContain("Service Uptime");
+    expect(body).toContain("Identity");
+    expect(body).toContain("data-model-id=\"service-uptime\"");
+    expect(body).not.toContain("primary");
+    expect(body).not.toContain("secondary");
+  });
+
+  test("renders invalid model state without crashing", () => {
+    const body = renderToString(
+      <AppStateView
+        dashboard={{
+          state: "invalid",
+          title: "Invalid Dashboard",
+          subtitle: "Validation failed",
+          message: "Dashboard document is invalid.",
+          errors: ["/metadata/title is required"],
+        }}
+      />,
+    );
+
+    expect(body).toContain("Invalid Dashboard");
+    expect(body).toContain("Validation failed");
+    expect(body).toContain("Dashboard document is invalid.");
+    expect(body).toContain("/metadata/title is required");
+  });
+
+  test("renders empty and loading model states without crashing", () => {
+    const empty = renderToString(
+      <AppStateView
+        dashboard={{
+          state: "empty",
+          title: "No Dashboard Model",
+          subtitle: "No active document",
+          message: "No validated dashboard document is active yet.",
+        }}
+      />,
+    );
+    const loading = renderToString(
+      <AppStateView
+        dashboard={{
+          state: "loading",
+          title: "Loading Dashboard",
+          subtitle: "Fetching active model",
+          message: "Waiting for the active dashboard document.",
+        }}
+      />,
+    );
+
+    expect(empty).toContain("No Dashboard Model");
+    expect(empty).toContain("No active document");
+    expect(loading).toContain("Loading Dashboard");
+    expect(loading).toContain("Fetching active model");
+  });
+});