Enhance calendar functionality: display year in month header, highlight past dates, and update date selection logic

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

@@ -7,10 +7,10 @@
 		</div>
 	</div>
 	}
-	@for (month of [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]; track $index) {
+	@for (month of months; track $index) {
 	<mat-card>
 		<mat-card-content>
-			<app-calendar-month [monthIndex]="month" [year]="year" [selectedDates]="selectedDates"></app-calendar-month>
+			<app-calendar-month [monthIndex]="month" [year]="getYear(month)" [selectedDates]="selectedDates"></app-calendar-month>
 		</mat-card-content>
 	</mat-card>
 	}