Refactors calendar architecture for month view

Prepares the calendar component for month view implementation
by introducing a strategy pattern for view management,
splitting configuration settings, and consolidating events
into a core set. It also removes dead code and enforces type safety,
improving overall code quality and maintainability.

Addresses critical issues identified in the code review,
laying the groundwork for efficient feature addition.

src/constants/CoreEvents.ts

@@ -0,0 +1,84 @@
+/**
+ * CoreEvents - Consolidated essential events for the calendar
+ * Reduces complexity from 102+ events to ~20 core events
+ */
+export const CoreEvents = {
+  // Lifecycle events (3)
+  INITIALIZED: 'core:initialized',
+  READY: 'core:ready',
+  DESTROYED: 'core:destroyed',
+  
+  // View events (3)
+  VIEW_CHANGED: 'view:changed',
+  VIEW_RENDERED: 'view:rendered',
+  WORKWEEK_CHANGED: 'workweek:changed',
+  
+  // Navigation events (3)
+  DATE_CHANGED: 'nav:date-changed',
+  PERIOD_CHANGED: 'nav:period-changed',
+  WEEK_CHANGED: 'nav:week-changed',
+  
+  // Data events (4)
+  DATA_LOADING: 'data:loading',
+  DATA_LOADED: 'data:loaded',
+  DATA_ERROR: 'data:error',
+  EVENTS_FILTERED: 'data:events-filtered',
+  
+  // Grid events (3)
+  GRID_RENDERED: 'grid:rendered',
+  GRID_CLICKED: 'grid:clicked',
+  CELL_SELECTED: 'grid:cell-selected',
+  
+  // Event management (4)
+  EVENT_CREATED: 'event:created',
+  EVENT_UPDATED: 'event:updated',
+  EVENT_DELETED: 'event:deleted',
+  EVENT_SELECTED: 'event:selected',
+  
+  // System events (2)
+  ERROR: 'system:error',
+  REFRESH_REQUESTED: 'system:refresh'
+} as const;
+
+// Type for the event values
+export type CoreEventType = typeof CoreEvents[keyof typeof CoreEvents];
+
+/**
+ * Migration map from old EventTypes to CoreEvents
+ * This helps transition existing code gradually
+ */
+export const EVENT_MIGRATION_MAP: Record<string, string> = {
+  // Lifecycle
+  'calendar:initialized': CoreEvents.INITIALIZED,
+  'calendar:ready': CoreEvents.READY,
+  
+  // View
+  'calendar:viewchanged': CoreEvents.VIEW_CHANGED,
+  'calendar:viewrendered': CoreEvents.VIEW_RENDERED,
+  'calendar:workweekchanged': CoreEvents.WORKWEEK_CHANGED,
+  
+  // Navigation
+  'calendar:datechanged': CoreEvents.DATE_CHANGED,
+  'calendar:periodchange': CoreEvents.PERIOD_CHANGED,
+  'calendar:weekchanged': CoreEvents.WEEK_CHANGED,
+  
+  // Data
+  'calendar:datafetchstart': CoreEvents.DATA_LOADING,
+  'calendar:datafetchsuccess': CoreEvents.DATA_LOADED,
+  'calendar:datafetcherror': CoreEvents.DATA_ERROR,
+  'calendar:eventsloaded': CoreEvents.DATA_LOADED,
+  
+  // Grid
+  'calendar:gridrendered': CoreEvents.GRID_RENDERED,
+  'calendar:gridclick': CoreEvents.GRID_CLICKED,
+  
+  // Event management
+  'calendar:eventcreated': CoreEvents.EVENT_CREATED,
+  'calendar:eventupdated': CoreEvents.EVENT_UPDATED,
+  'calendar:eventdeleted': CoreEvents.EVENT_DELETED,
+  'calendar:eventselected': CoreEvents.EVENT_SELECTED,
+  
+  // System
+  'calendar:error': CoreEvents.ERROR,
+  'calendar:refreshrequested': CoreEvents.REFRESH_REQUESTED
+};