Refactors dependency injection and configuration management

Replaces global singleton configuration with dependency injection
Introduces more modular and testable approach to configuration
Removes direct references to calendarConfig in multiple components
Adds explicit configuration passing to constructors

Improves code maintainability and reduces global state dependencies

src/managers/ViewManager.ts

@@ -1,6 +1,6 @@
 import { EventBus } from '../core/EventBus';
 import { CalendarView, IEventBus } from '../types/CalendarTypes';
-import { calendarConfig } from '../core/CalendarConfig';
+import { CalendarConfig } from '../core/CalendarConfig';
 import { CoreEvents } from '../constants/CoreEvents';
 
 /**
@@ -9,17 +9,19 @@ import { CoreEvents } from '../constants/CoreEvents';
  */
 export class ViewManager {
     private eventBus: IEventBus;
+    private config: CalendarConfig;
     private currentView: CalendarView = 'week';
     private buttonListeners: Map<Element, EventListener> = new Map();
-    
+
     // Cached DOM elements for performance
     private cachedViewButtons: NodeListOf<Element> | null = null;
     private cachedWorkweekButtons: NodeListOf<Element> | null = null;
     private lastButtonCacheTime: number = 0;
     private readonly CACHE_DURATION = 5000; // 5 seconds
 
-    constructor(eventBus: IEventBus) {
+    constructor(eventBus: IEventBus, config: CalendarConfig) {
         this.eventBus = eventBus;
+        this.config = config;
         this.setupEventListeners();
     }
 
@@ -140,13 +142,13 @@ export class ViewManager {
      */
     private changeWorkweek(workweekId: string): void {
         // Update the calendar config (does not emit events)
-        calendarConfig.setWorkWeek(workweekId);
+        this.config.setWorkWeek(workweekId);
 
         // Update button states using cached elements
         this.updateAllButtons();
 
         // Emit workweek change event with full payload
-        const settings = calendarConfig.getWorkWeekSettings();
+        const settings = this.config.getWorkWeekSettings();
         this.eventBus.emit(CoreEvents.WORKWEEK_CHANGED, {
             workWeekId: workweekId,
             settings: settings
@@ -166,7 +168,7 @@ export class ViewManager {
         this.updateButtonGroup(
             this.getWorkweekButtons(),
             'data-workweek',
-            calendarConfig.getCurrentWorkWeek()
+            this.config.getCurrentWorkWeek()
         );
     }