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/ics.ts

@@ -0,0 +1,71 @@
+import * as ical from 'node-ical';
+import type { AgendaEvent } from '../todayview';
+
+export async function fetchICSAgenda(
+  urls: string[]
+): Promise<AgendaEvent[]> {
+  const now = new Date();
+  const startOfDay = new Date(now);
+  startOfDay.setHours(0, 0, 0, 0);
+  const endOfDay = new Date(now);
+  endOfDay.setHours(23, 59, 59, 999);
+
+  const allEvents = (
+    await Promise.all(urls.map((url) => fetchOne(url, startOfDay, endOfDay)))
+  ).flat();
+
+  allEvents.sort((a, b) => a.sortKey - b.sortKey);
+
+  return allEvents.map(({ sortKey, ...event }) => event);
+}
+
+interface RawAgendaEvent extends AgendaEvent {
+  sortKey: number;
+}
+
+async function fetchOne(
+  url: string,
+  start: Date,
+  end: Date
+): Promise<RawAgendaEvent[]> {
+  const resp = await fetch(url, {
+    headers: [['User-Agent', 'private TRMNL fetcher']],
+  });
+  const data = await resp.text();
+  const parsed = Object.values(await ical.async.parseICS(data)).filter(
+    (a) => a?.type === 'VEVENT'
+  );
+
+  const events: RawAgendaEvent[] = [];
+
+  for (const event of parsed) {
+    for (const instance of ical.expandRecurringEvent(event, {
+      from: start,
+      to: end,
+      excludeExdates: true,
+      expandOngoing: true,
+      includeOverrides: true,
+    })) {
+      if (instance.isFullDay) continue;
+
+      const startTime = formatTime(instance.start);
+      const endTime = formatTime(instance.end);
+      const location = (instance.event as any).location ?? '';
+
+      events.push({
+        start: startTime,
+        end: endTime,
+        title: (instance.summary as string) ?? '',
+        where: location,
+        kind: '',
+        sortKey: instance.start.valueOf(),
+      });
+    }
+  }
+
+  return events;
+}
+
+function formatTime(d: Date): string {
+  return `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`;
+}