Add general calendar events (recording, social, task, general); nav links; v1.1.16

- Four event types on the calendar: General, Recording, Social, Task — each color-coded
- + Event button opens form with type picker, title, date, notes, reminder
- Task events have a Mark Complete toggle; completed events show strikethrough
- Edit/delete popover for each event
- Email reminders work for calendar events same as episodes
- Added Email/Calendar nav links to /contacts header
- Added Email link to /calendar header (already had Admin)
- /email already links to Contacts and Calendar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/data.js

@@ -31,6 +31,7 @@ import {
   EPISODE_PLAYS_FILE,
   ANALYTICS_EVENTS_FILE,
   EMAIL_SETTINGS_FILE,
+  CALENDAR_EVENTS_FILE,
   EMPTY_HIT_STATS,
   EMPTY_VISITOR_STATS,
   DEFAULT_REPLY_TEMPLATES,
@@ -416,6 +417,36 @@ export function loadEmailSettingsFromDisk() {
     })
 }
 
+// ── Calendar events ────────────────────────────────────────────────────────
+
+export function queueCalendarEventsWrite() {
+  state.calendarEventsWritePromise = state.calendarEventsWritePromise
+    .then(async () => {
+      await mkdir(DATA_DIR, { recursive: true })
+      await writeFile(
+        CALENDAR_EVENTS_FILE,
+        JSON.stringify({ events: state.calendarEvents, updatedAt: new Date().toISOString() }, null, 2),
+        'utf8',
+      )
+    })
+    .catch(err => {
+      console.error('[calendar-events] failed to write:', err)
+    })
+}
+
+export function loadCalendarEventsFromDisk() {
+  return readFile(CALENDAR_EVENTS_FILE, 'utf8')
+    .then(raw => {
+      const parsed = JSON.parse(raw)
+      if (Array.isArray(parsed?.events)) {
+        state.calendarEvents = parsed.events
+      }
+    })
+    .catch(() => {
+      // No file yet — start with empty array
+    })
+}
+
 // ── Podcast checklist ──────────────────────────────────────────────────────
 
 export function queuePodcastChecklistWrite() {