test: Migrate test suite to Bun's native testing framework

- Update test files to use Bun's native test and mocking utilities
- Replace Jest-specific imports and mocking techniques with Bun equivalents
- Refactor test setup to use Bun's mock module and testing conventions
- Add new `test/setup.ts` for global test configuration and mocks
- Improve test reliability and simplify mocking approach
- Update TypeScript configuration to support Bun testing ecosystem

src/hass/types.ts

@@ -0,0 +1,74 @@
+import type { WebSocket } from 'ws';
+
+export interface HassInstanceImpl {
+    baseUrl: string;
+    token: string;
+    connect(): Promise<void>;
+    disconnect(): Promise<void>;
+    getStates(): Promise<any[]>;
+    callService(domain: string, service: string, data?: any): Promise<void>;
+    fetchStates(): Promise<any[]>;
+    fetchState(entityId: string): Promise<any>;
+    subscribeEvents(callback: (event: any) => void, eventType?: string): Promise<number>;
+    unsubscribeEvents(subscriptionId: number): Promise<void>;
+}
+
+export interface HassWebSocketClient {
+    url: string;
+    token: string;
+    socket: WebSocket | null;
+    connect(): Promise<void>;
+    disconnect(): Promise<void>;
+    send(message: any): Promise<void>;
+    subscribe(callback: (data: any) => void): () => void;
+}
+
+export interface HassState {
+    entity_id: string;
+    state: string;
+    attributes: Record<string, any>;
+    last_changed: string;
+    last_updated: string;
+    context: {
+        id: string;
+        parent_id: string | null;
+        user_id: string | null;
+    };
+}
+
+export interface HassServiceCall {
+    domain: string;
+    service: string;
+    target?: {
+        entity_id?: string | string[];
+        device_id?: string | string[];
+        area_id?: string | string[];
+    };
+    service_data?: Record<string, any>;
+}
+
+export interface HassEvent {
+    event_type: string;
+    data: any;
+    origin: string;
+    time_fired: string;
+    context: {
+        id: string;
+        parent_id: string | null;
+        user_id: string | null;
+    };
+}
+
+export type MockFunction<T extends (...args: any[]) => any> = {
+    (...args: Parameters<T>): ReturnType<T>;
+    mock: {
+        calls: Parameters<T>[];
+        results: { type: 'return' | 'throw'; value: any }[];
+        instances: any[];
+        mockImplementation(fn: T): MockFunction<T>;
+        mockReturnValue(value: ReturnType<T>): MockFunction<T>;
+        mockResolvedValue(value: Awaited<ReturnType<T>>): MockFunction<T>;
+        mockRejectedValue(value: any): MockFunction<T>;
+        mockReset(): void;
+    };
+};