feat(layout): finalize p01 and p02 changes

Complete UI foundation and app layout implementation, stabilize container health checks, and archive both OpenSpec changes after verification.

frontend/tests/component/topbar.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import TopBar from '../../src/lib/components/layout/TopBar.svelte';
+
+describe('TopBar component', () => {
+  it('exports a component module', () => {
+    expect(TopBar).toBeDefined();
+  });
+
+  it('includes breadcrumbs, month selector, and user menu', () => {
+    const source = readFileSync(
+      resolve(process.cwd(), 'src/lib/components/layout/TopBar.svelte'),
+      'utf-8'
+    );
+
+    expect(source).toContain('<Breadcrumbs />');
+    expect(source).toContain('<MonthSelector />');
+    expect(source).toContain('<UserMenu />');
+  });
+});