Show a project's roadmap, releases and first issues from TaskStream

When a project has a board in TaskStream, its page lists the epics with
their dates and progress, the releases with their notes, the sprint under
way and the tickets meant for newcomers, linking to the board. TaskStream
being slow or down only leaves those sections out.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

landing/src/app/core/taskstream.spec.ts

@@ -0,0 +1,47 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { boardLink, fetchShowcase, hasContent } from './taskstream';
+
+const showcase = {
+  project: { id: 'p', key: 'WEB', name: 'Web', description: null },
+  activeSprint: null,
+  roadmap: [],
+  releases: [],
+  goodFirst: [
+    { key: 'WEB-9', title: 'Typo', type: 'TASK', path: '/p/WEB/issues/WEB-9' },
+  ],
+};
+
+describe('TaskStream showcase', () => {
+  afterEach(() => vi.unstubAllGlobals());
+
+  it('reads a showcase, and goes without it when TaskStream fails', async () => {
+    vi.stubGlobal(
+      'fetch',
+      vi.fn(async () => new Response(JSON.stringify(showcase))),
+    );
+    expect(await fetchShowcase('https://api.ts/showcase')).toEqual(showcase);
+
+    vi.stubGlobal(
+      'fetch',
+      vi.fn(async () => new Response('nope', { status: 404 })),
+    );
+    expect(await fetchShowcase('https://api.ts/showcase')).toBeNull();
+
+    vi.stubGlobal(
+      'fetch',
+      vi.fn(async () => {
+        throw new Error('down');
+      }),
+    );
+    expect(await fetchShowcase('https://api.ts/showcase')).toBeNull();
+  });
+
+  it('builds links into the board and knows an empty one', () => {
+    expect(
+      boardLink('https://taskstream.pireon.dev/', '/p/WEB/issues/WEB-9'),
+    ).toBe('https://taskstream.pireon.dev/p/WEB/issues/WEB-9');
+    expect(hasContent(showcase)).toBe(true);
+    expect(hasContent({ ...showcase, goodFirst: [] })).toBe(false);
+  });
+});