🛠️ Configure testing setup and update Vitest configuration

code/websites/pokedex.online/tests/setup.js

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+/**
+ * Test Setup File
+ * Runs before all tests to configure global test environment
+ */
+
+import { vi } from 'vitest';
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: vi.fn(),
+  setItem: vi.fn(),
+  removeItem: vi.fn(),
+  clear: vi.fn()
+};
+global.localStorage = localStorageMock;
+
+// Mock sessionStorage
+const sessionStorageMock = {
+  getItem: vi.fn(),
+  setItem: vi.fn(),
+  removeItem: vi.fn(),
+  clear: vi.fn()
+};
+global.sessionStorage = sessionStorageMock;
+
+// Mock fetch
+global.fetch = vi.fn();
+
+// Mock console methods to reduce noise in tests
+global.console = {
+  ...console,
+  error: vi.fn(),
+  warn: vi.fn(),
+  log: vi.fn(),
+  debug: vi.fn()
+};
+
+// Reset all mocks before each test
+beforeEach(() => {
+  vi.clearAllMocks();
+  localStorageMock.getItem.mockReset();
+  localStorageMock.setItem.mockReset();
+  localStorageMock.removeItem.mockReset();
+  localStorageMock.clear.mockReset();
+  sessionStorageMock.getItem.mockReset();
+  sessionStorageMock.setItem.mockReset();
+  sessionStorageMock.removeItem.mockReset();
+  sessionStorageMock.clear.mockReset();
+});

code/websites/pokedex.online/vitest.config.js

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+import { defineConfig } from 'vitest/config';
+import vue from '@vitejs/plugin-vue';
+import { fileURLToPath } from 'node:url';
+
+export default defineConfig({
+  plugins: [vue()],
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    }
+  },
+  test: {
+    globals: true,
+    environment: 'happy-dom',
+    setupFiles: ['./tests/setup.js'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html', 'lcov'],
+      exclude: [
+        'node_modules/',
+        'tests/',
+        'dist/',
+        'server/',
+        '*.config.js',
+        '.eslintrc.cjs'
+      ],
+      thresholds: {
+        lines: 80,
+        functions: 80,
+        branches: 75,
+        statements: 80
+      }
+    },
+    include: ['tests/**/*.test.js', 'tests/**/*.spec.js']
+  }
+});