Add recurring series to events

A Series checkbox under When opens a panel for the schedule:
weekly on chosen weekdays, monthly by date, or monthly by weekday
position, every N weeks or months, with meeting times and an
optional meeting count. starts_on anchors the schedule and ends_on
bounds it, so effective_status needs no change.

Occurrences are derived, not stored. src/lib/eventSeries.ts builds
the schedule label shown on cards and the event page, and the
upcoming dates listed on the event page.

Migration 016 adds the columns; the CRUD engine gains a time type.

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

src/pages/sections/EventList-Cards.tsx

@@ -8,6 +8,7 @@ import {
 } from "../../data/eventData.js";
 import { eventHref } from "../../lib/hrefs.ts";
 import { EVENT_TYPES, eventTypeLabel, type EventType } from "../../lib/eventTypes.ts";
+import { seriesLabel } from "../../lib/eventSeries.ts";
 import type { EventListItem } from "../../lib/useContent.ts";
 import type { SectionToggleProps } from "../../lib/sections.tsx";
 
@@ -195,6 +196,7 @@ export function Card({
   const color = ev.color || defaultColor;
   const orgLogo = ev.org_logo || DEFAULT_ORG_LOGO;
   const eventLogo = ev.event_logo;
+  const schedule = seriesLabel(ev.series, ev.starts_on);
   const links = ev.links ?? [];
   const igHandle = ev.instagram || null;
   const igUrl = igHandle
@@ -255,6 +257,7 @@ export function Card({
                 <p className="text-xl font-300 font-bold">"{ev.theme}"</p>
               )}
               {ev.date_label && <p className="text-xl">{ev.date_label}</p>}
+              {schedule && <p className="text-xl">{schedule}</p>}
               {ev.location_label && (
                 <p className="text-xl">{ev.location_label}</p>
               )}
@@ -282,6 +285,7 @@ export function Card({
                   <p className="text-2xl font-300 font-bold">"{ev.theme}"</p>
                 )}
                 {ev.date_label && <p className="text-2xl">{ev.date_label}</p>}
+                {schedule && <p className="text-2xl">{schedule}</p>}
                 {ev.location_label && (
                   <p className="text-2xl">{ev.location_label}</p>
                 )}