Add today-view plugin with Tana, ICS, and Donetick data sources

Implements an e-ink daily dashboard plugin ("today") with four sections:
date/focus/success header, agenda timeline, chores checklist, and
due/overdue task lists.

Data sources:
- Focus & success text: Tana daily note (src/sources/tana.ts)
- Due/overdue tasks: Tana task search (src/sources/tana.ts)
- Agenda events: ICS calendar feeds (src/sources/ics.ts)
- Chores: Donetick API (src/sources/donetick.ts)

All sources fetch in parallel and fall back gracefully on error.
Tests use mock HTTP servers with synthetic data — no real services needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/sources/donetick.test.ts

@@ -0,0 +1,63 @@
+import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
+import type { Server } from 'bun';
+import { fetchDonetickChores } from './donetick';
+
+const today = new Date().toISOString().slice(0, 10);
+const tomorrow = new Date(Date.now() + 86_400_000).toISOString().slice(0, 10);
+const yesterday = new Date(Date.now() - 86_400_000).toISOString().slice(0, 10);
+
+const CHORES = [
+  { id: 1, name: 'Make the bed', assignedTo: 1, nextDueDate: `${tomorrow}T00:00:00Z`, isActive: true },
+  { id: 2, name: 'Water the plants', assignedTo: 1, nextDueDate: `${today}T00:00:00Z`, isActive: true },
+  { id: 3, name: 'Walk the dog', assignedTo: 2, nextDueDate: `${today}T00:00:00Z`, isActive: true },
+  { id: 4, name: 'Inactive chore', assignedTo: 1, nextDueDate: `${today}T00:00:00Z`, isActive: false },
+  { id: 5, name: 'Shared chore', assignedTo: 2, nextDueDate: `${yesterday}T00:00:00Z`, isActive: true, assignees: [{ userId: 1 }, { userId: 2 }] },
+];
+
+let server: Server;
+let baseUrl: string;
+
+beforeAll(() => {
+  server = Bun.serve({
+    port: 0,
+    hostname: '127.0.0.1',
+    routes: {
+      '/eapi/v1/chore': (req) => {
+        if (req.headers.get('secretkey') !== 'test-token')
+          return new Response('Unauthorized', { status: 401 });
+        return Response.json(CHORES);
+      },
+    },
+  });
+  baseUrl = `http://127.0.0.1:${server.port}`;
+});
+
+afterAll(() => {
+  server.stop();
+});
+
+describe('donetick source', () => {
+  test('fetches chores for the configured user', async () => {
+    const chores = await fetchDonetickChores({
+      url: baseUrl,
+      token: 'test-token',
+      user_id: 1,
+    });
+
+    // Should include: Water the plants (due today), Shared chore (overdue, in assignees)
+    // Should exclude: Make the bed (done, nextDueDate=tomorrow), Walk the dog (different user), Inactive chore
+    expect(chores).toHaveLength(2);
+    expect(chores.map((c) => c.text)).toContain('Water the plants');
+    expect(chores.map((c) => c.text)).toContain('Shared chore');
+    expect(chores.map((c) => c.text)).not.toContain('Make the bed');
+    expect(chores.map((c) => c.text)).not.toContain('Walk the dog');
+    expect(chores.map((c) => c.text)).not.toContain('Inactive chore');
+
+  });
+
+  test('throws on auth failure', async () => {
+    await expect(
+      fetchDonetickChores({ url: baseUrl, token: 'wrong', user_id: 1 })
+    ).rejects.toThrow('401');
+  });
+});