test: update calendar year planning tests for user interaction and state management

src/app/components/calendar-year/calendar-year.ts

@@ -552,7 +552,6 @@ export class CalendarYear {
 				if (version !== this.calculationVersion) return;
 				this.planningExplanation.set(explanation ?? null);
 				if (explanation?.kind === 'PlanExplanation') {
-					this.planDetailsOpen.set(true);
 					this.selectPlacement(0, false);
 					this.liveMessage.set(
 						`${this.planningOutcome() ? this.outcomeLabel(this.planningOutcome()!) : ''} ${this.placementAnnouncement()}`.trim(),