Enhance Jest configuration and testing infrastructure

- Updated Jest configuration to support ESM and improve test coverage
- Added comprehensive test files for helpers, index, context, and HASS integration
- Configured coverage reporting and added new test scripts
- Updated Jest resolver to handle module resolution for chalk and related packages
- Introduced new test setup files for mocking and environment configuration

src/types/hass.d.ts

@@ -0,0 +1,81 @@
+declare namespace HomeAssistant {
+    interface Entity {
+        entity_id: string;
+        state: string;
+        attributes: Record<string, any>;
+        last_changed: string;
+        last_updated: string;
+        context: {
+            id: string;
+            parent_id?: string;
+            user_id?: string;
+        };
+    }
+
+    interface Service {
+        domain: string;
+        service: string;
+        target?: {
+            entity_id?: string | string[];
+            device_id?: string | string[];
+            area_id?: string | string[];
+        };
+        service_data?: Record<string, any>;
+    }
+
+    interface WebsocketMessage {
+        type: string;
+        id?: number;
+        [key: string]: any;
+    }
+
+    interface AuthMessage extends WebsocketMessage {
+        type: 'auth';
+        access_token: string;
+    }
+
+    interface SubscribeEventsMessage extends WebsocketMessage {
+        type: 'subscribe_events';
+        event_type?: string;
+    }
+
+    interface StateChangedEvent {
+        event_type: 'state_changed';
+        data: {
+            entity_id: string;
+            new_state: Entity | null;
+            old_state: Entity | null;
+        };
+        origin: string;
+        time_fired: string;
+        context: {
+            id: string;
+            parent_id?: string;
+            user_id?: string;
+        };
+    }
+
+    interface Config {
+        latitude: number;
+        longitude: number;
+        elevation: number;
+        unit_system: {
+            length: string;
+            mass: string;
+            temperature: string;
+            volume: string;
+        };
+        location_name: string;
+        time_zone: string;
+        components: string[];
+        version: string;
+    }
+
+    interface ApiError {
+        code: string;
+        message: string;
+        details?: Record<string, any>;
+    }
+}
+
+export = HomeAssistant;