Refactors calendar initialization with factory

Implements a factory pattern for manager creation and
initialization, improving dependency management and
extensibility.

This change replaces direct manager instantiation with a
`ManagerFactory` that handles dependency injection. This
enhances code organization and testability. It also includes
an initialization sequence diagram for better understanding
of the calendar's architecture and data flow.

src/interfaces/IManager.ts

@@ -0,0 +1,53 @@
+/**
+ * Base interface for all managers
+ */
+export interface IManager {
+  /**
+   * Initialize the manager
+   */
+  initialize?(): Promise<void> | void;
+
+  /**
+   * Refresh the manager's state
+   */
+  refresh?(): void;
+
+  /**
+   * Destroy the manager and clean up resources
+   */
+  destroy?(): void;
+}
+
+/**
+ * Interface for managers that handle events
+ */
+export interface IEventManager extends IManager {
+  loadData(): Promise<void>;
+  getEvents(): any[];
+  getEventsForPeriod(startDate: Date, endDate: Date): any[];
+}
+
+/**
+ * Interface for managers that handle rendering
+ */
+export interface IRenderingManager extends IManager {
+  render(): Promise<void> | void;
+}
+
+/**
+ * Interface for managers that handle navigation
+ */
+export interface INavigationManager extends IManager {
+  getCurrentWeek(): Date;
+  navigateToToday(): void;
+  navigateToNextWeek(): void;
+  navigateToPreviousWeek(): void;
+}
+
+/**
+ * Interface for managers that handle scrolling
+ */
+export interface IScrollManager extends IManager {
+  scrollTo(scrollTop: number): void;
+  scrollToHour(hour: number): void;
+}