feat(caldav): add FeedItemRenderer (#74)

Implement renderCalDavFeedItem using JRX JSX to render
CalDAV events as FeedCard components. Bump @nym.sh/jrx
to 0.2.0 for null/undefined child support.

Co-authored-by: Ona <no-reply@ona.com>

packages/aelis-source-caldav/src/index.ts

@@ -1,6 +1,7 @@
 export { CalDavCalendarKey, type CalendarContext } from "./calendar-context.ts"
 export { CalDavSource, type CalDavSourceOptions } from "./caldav-source.ts"
 export { parseICalEvents, type ICalTimeRange } from "./ical-parser.ts"
+export { renderCalDavFeedItem } from "./renderer.tsx"
 export {
 	AttendeeRole,
 	AttendeeStatus,