Adds workweek settings and dynamic view configuration

Introduces settings service for managing tenant-specific calendar configurations

Enables dynamic workweek presets with configurable work days
Improves view switching with enhanced UI components
Adds flexible calendar rendering based on tenant settings

Extends DateService to support workweek date generation

src/v2/storage/IndexedDBContext.ts

@@ -10,7 +10,7 @@ import { IStore } from './IStore';
  */
 export class IndexedDBContext {
   private static readonly DB_NAME = 'CalendarV2DB';
-  private static readonly DB_VERSION = 3;
+  private static readonly DB_VERSION = 4;
 
   private db: IDBDatabase | null = null;
   private initialized: boolean = false;

src/v2/storage/settings/SettingsService.ts

@@ -0,0 +1,60 @@
+import { EntityType, IEventBus } from '../../types/CalendarTypes';
+import { ITenantSettings, IWorkweekPreset } from '../../types/SettingsTypes';
+import { SettingsStore } from './SettingsStore';
+import { BaseEntityService } from '../BaseEntityService';
+import { IndexedDBContext } from '../IndexedDBContext';
+
+/**
+ * Default settings ID - single document per tenant
+ */
+const TENANT_SETTINGS_ID = 'tenant-settings';
+
+/**
+ * SettingsService - CRUD operations for tenant settings
+ *
+ * Settings are stored as a single document with sections.
+ * This service provides convenience methods for accessing specific sections.
+ */
+export class SettingsService extends BaseEntityService<ITenantSettings> {
+  readonly storeName = SettingsStore.STORE_NAME;
+  readonly entityType: EntityType = 'Settings';
+
+  constructor(context: IndexedDBContext, eventBus: IEventBus) {
+    super(context, eventBus);
+  }
+
+  /**
+   * Get the tenant settings document
+   * Returns null if not yet loaded from backend
+   */
+  async getSettings(): Promise<ITenantSettings | null> {
+    return this.get(TENANT_SETTINGS_ID);
+  }
+
+  /**
+   * Get workweek preset by ID
+   */
+  async getWorkweekPreset(presetId: string): Promise<IWorkweekPreset | null> {
+    const settings = await this.getSettings();
+    if (!settings) return null;
+    return settings.workweek.presets[presetId] || null;
+  }
+
+  /**
+   * Get the default workweek preset
+   */
+  async getDefaultWorkweekPreset(): Promise<IWorkweekPreset | null> {
+    const settings = await this.getSettings();
+    if (!settings) return null;
+    return settings.workweek.presets[settings.workweek.defaultPreset] || null;
+  }
+
+  /**
+   * Get all available workweek presets
+   */
+  async getWorkweekPresets(): Promise<IWorkweekPreset[]> {
+    const settings = await this.getSettings();
+    if (!settings) return [];
+    return Object.values(settings.workweek.presets);
+  }
+}

src/v2/storage/settings/SettingsStore.ts

@@ -0,0 +1,16 @@
+import { IStore } from '../IStore';
+
+/**
+ * SettingsStore - IndexedDB ObjectStore definition for tenant settings
+ *
+ * Single store for all settings sections. Settings are stored as one document
+ * per tenant with id='tenant-settings'.
+ */
+export class SettingsStore implements IStore {
+  static readonly STORE_NAME = 'settings';
+  readonly storeName = SettingsStore.STORE_NAME;
+
+  create(db: IDBDatabase): void {
+    db.createObjectStore(SettingsStore.STORE_NAME, { keyPath: 'id' });
+  }
+}