Refactor calendar V2 core with DI and new features

Introduces dependency injection container and composition root
Adds core services like DateService and NavigationAnimator
Simplifies CalendarOrchestrator with improved store handling
Implements mock stores and demo application for V2 calendar

src/v2/demo/MockStores.ts

@@ -0,0 +1,40 @@
+import { IGroupingStore } from '../core/IGroupingStore';
+
+export interface Team {
+  id: string;
+  name: string;
+}
+
+export interface Resource {
+  id: string;
+  name: string;
+  teamId: string;
+}
+
+export class MockTeamStore implements IGroupingStore<Team> {
+  readonly type = 'team';
+
+  private teams: Team[] = [
+    { id: 'alpha', name: 'Team Alpha' },
+    { id: 'beta', name: 'Team Beta' }
+  ];
+
+  getByIds(ids: string[]): Team[] {
+    return this.teams.filter(t => ids.includes(t.id));
+  }
+}
+
+export class MockResourceStore implements IGroupingStore<Resource> {
+  readonly type = 'resource';
+
+  private resources: Resource[] = [
+    { id: 'alice', name: 'Alice', teamId: 'alpha' },
+    { id: 'bob', name: 'Bob', teamId: 'alpha' },
+    { id: 'carol', name: 'Carol', teamId: 'beta' },
+    { id: 'dave', name: 'Dave', teamId: 'beta' }
+  ];
+
+  getByIds(ids: string[]): Resource[] {
+    return this.resources.filter(r => ids.includes(r.id));
+  }
+}