feat(dashboard): align contracts and production build

tests/dashboard-assets.test.ts

@@ -0,0 +1,27 @@
+import path from 'node:path';
+import { describe, expect, it, vi } from 'vitest';
+import { resolveDashboardAssets } from '../src/web/dashboard-assets.js';
+
+describe('resolveDashboardAssets', () => {
+  it('selects the built React dashboard when its index exists', () => {
+    const workspace = path.resolve('workspace');
+    const reactIndex = path.join(workspace, 'apps', 'dashboard', 'dist', 'index.html');
+    const fileExists = vi.fn((candidate: string) => candidate === reactIndex);
+
+    expect(resolveDashboardAssets(workspace, fileExists)).toEqual({
+      directory: path.dirname(reactIndex),
+      indexFile: reactIndex,
+      isLegacy: false,
+    });
+  });
+
+  it('falls back to the legacy dashboard during incremental migration', () => {
+    const workspace = path.resolve('workspace');
+
+    expect(resolveDashboardAssets(workspace, () => false)).toEqual({
+      directory: path.join(workspace, 'public'),
+      indexFile: path.join(workspace, 'public', 'index.html'),
+      isLegacy: true,
+    });
+  });
+});