Refactors calendar data management and sync infrastructure

Introduces comprehensive data management system for calendar V2
- Adds IndexedDB storage with pluggable entity services
- Implements EventBus for decoupled event communication
- Creates data seeding mechanism for initial application setup
- Establishes sync and repository abstractions for flexible data handling

src/v2/demo/DemoApp.ts

@@ -5,6 +5,8 @@ import { DateService } from '../core/DateService';
 import { ScrollManager } from '../core/ScrollManager';
 import { HeaderDrawerManager } from '../core/HeaderDrawerManager';
 import { ViewConfig } from '../core/ViewConfig';
+import { IndexedDBContext } from '../storage/IndexedDBContext';
+import { DataSeeder } from '../workers/DataSeeder';
 
 export class DemoApp {
   private animator!: NavigationAnimator;
@@ -17,10 +19,20 @@ export class DemoApp {
     private timeAxisRenderer: TimeAxisRenderer,
     private dateService: DateService,
     private scrollManager: ScrollManager,
-    private headerDrawerManager: HeaderDrawerManager
+    private headerDrawerManager: HeaderDrawerManager,
+    private indexedDBContext: IndexedDBContext,
+    private dataSeeder: DataSeeder
   ) {}
 
-  init(): void {
+  async init(): Promise<void> {
+    // Initialize IndexedDB
+    await this.indexedDBContext.initialize();
+    console.log('[DemoApp] IndexedDB initialized');
+
+    // Seed data if empty
+    await this.dataSeeder.seedIfEmpty();
+    console.log('[DemoApp] Data seeding complete');
+
     this.container = document.querySelector('swp-calendar-container') as HTMLElement;
 
     // NavigationAnimator har DOM-dependencies - tilladt med new

src/v2/demo/index.ts

@@ -1,5 +1,5 @@
 import { createV2Container } from '../V2CompositionRoot';
 import { DemoApp } from './DemoApp';
 
-const app = createV2Container();
-app.resolveType<DemoApp>().init();
+const container = createV2Container();
+container.resolveType<DemoApp>().init().catch(console.error);