feat(calendar): add responsible person and attendees to events

- Add ResponsiblePerson interface to shared types
- Create ResponsiblePersonSelector component with contact integration
- Integrate responsible person selector into EventForm
- Add people selectors to QuickEventOverlay with compact layout
- Fix click-outside detection for elements removed from DOM
- Support both contacts app integration and manual email entry

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/calendar/packages/shared/src/types/event.ts

@@ -18,6 +18,20 @@ export interface EventAttendee {
 	company?: string;
 }
 
+/**
+ * Responsible person for an event (single person accountable for the event)
+ */
+export interface ResponsiblePerson {
+	email: string;
+	name?: string;
+	/** Contact reference for linked contacts */
+	contactId?: string;
+	/** Cached photo URL from contact */
+	photoUrl?: string;
+	/** Cached company from contact */
+	company?: string;
+}
+
 /**
  * Event tag with color
  */
@@ -57,7 +71,9 @@ export interface EventMetadata {
 	url?: string;
 	/** Video conference URL (Zoom, Meet, etc.) */
 	conferenceUrl?: string;
-	/** Event attendees */
+	/** Responsible person for this event */
+	responsiblePerson?: ResponsiblePerson;
+	/** Event attendees/participants */
 	attendees?: EventAttendee[];
 	/** Event organizer email */
 	organizer?: string;