feat: add testing setup with Vitest and Testing Library

- Updated package.json to include Vitest and Testing Library dependencies and scripts for testing.
- Created a test suite for the ProvinceProvider context to validate cityId and province detection based on subdomains.
- Implemented unit tests for utility functions in helper/index.js, including phone number formatting and validation.
- Added tests for state information retrieval in lib/getStateInfo.js, ensuring correct city and state matching based on subdomains.
- Developed tests for appointment slot adaptation and availability checks in lib/appointmentSlots.js.
- Created tests for token storage functionality in lib/tokenStore.js.
- Implemented sanitization and JSON parsing tests in lib/sanitize.js.
- Added CASL ability tests in lib/ability.js to verify user access rights.
- Created tests for cookie management in lib/refreshCookie.js.
- Developed tests for patient user representation in lib/representationAdapters.js.
- Implemented client-side state information retrieval tests in lib/getStateInfoClient.js.
- Created tests for canonical URL generation in lib/getCanonicalUrl.js.
- Developed tests for clinic API service functions in services/clinicApi.js.
- Added request wrapper tests in services/response.js to ensure correct API interaction.
- Set up Vitest configuration in vitest.config.mjs for JSX support and alias resolution.
- Created setup and utility files for testing environment in test/setup.js and test/utils.jsx.

context/ProvinceProvider.test.jsx

@@ -0,0 +1,38 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+import { ProvinceProvider, useProvince } from '@/context/ProvinceProvider';
+
+function Probe() {
+    const { cityId, isProvinceInclude } = useProvince();
+    return <span data-testid="out">{cityId ? `${cityId}:${isProvinceInclude.name}` : 'none'}</span>;
+}
+
+function setHostname(hostname) {
+    Object.defineProperty(window, 'location', {
+        value: { hostname },
+        writable: true,
+        configurable: true,
+    });
+}
+
+describe('ProvinceProvider / useProvince', () => {
+    it('host شهر شناخته‌شده → cityId و شهر را از useEffect ست می‌کند', async () => {
+        setHostname('arak-nobat.ir');
+        render(
+            <ProvinceProvider>
+                <Probe />
+            </ProvinceProvider>,
+        );
+        await waitFor(() => expect(screen.getByTestId('out')).toHaveTextContent('129:اراک'));
+    });
+
+    it('host ناشناخته → cityId null', async () => {
+        setHostname('example.com');
+        render(
+            <ProvinceProvider>
+                <Probe />
+            </ProvinceProvider>,
+        );
+        await waitFor(() => expect(screen.getByTestId('out')).toHaveTextContent('none'));
+    });
+});