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/unit/navigation.config.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from 'vitest';
+import { navigationSections } from '../../src/lib/config/navigation';
+
+describe('navigation config', () => {
+  it('has expected section structure', () => {
+    expect(navigationSections).toHaveLength(3);
+
+    expect(navigationSections[0].title).toBe('PLANNING');
+    expect(navigationSections[0].items).toHaveLength(5);
+
+    expect(navigationSections[1].title).toBe('REPORTS');
+    expect(navigationSections[1].items).toHaveLength(5);
+
+    expect(navigationSections[2].title).toBe('ADMIN');
+    expect(navigationSections[2].roles).toEqual(['superuser']);
+  });
+});