fix(calendar): fix QuickEventOverlay z-index stacking issue

- Add portal action to move overlay to body, escaping parent stacking contexts
- Set z-index: 99999 via inline style to ensure overlay appears above all UI elements
- Remove z-index: 0 from main-content that was creating a stacking context
- Overlay now correctly displays above DateStrip, Toolbar, and InputBar

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

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

apps/calendar/apps/backend/src/event/event.service.ts

@@ -184,6 +184,16 @@ export class EventService {
 			conditions.push(inArray(events.calendarId, query.calendarIds));
 		}
 
+		// Search filter - search in title and description
+		if (query.search) {
+			conditions.push(
+				or(
+					ilike(events.title, `%${query.search}%`),
+					ilike(events.description, `%${query.search}%`)
+				) as any
+			);
+		}
+
 		const result = await this.db
 			.select({
 				event: events,