feat(tests): add frontend automated testing setup with Vitest and jsdom

vitest.config.js

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['tests/frontend/setup.js'],
+    include: [
+      'static/js/**/*.test.js',
+      'tests/frontend/**/*.test.js'
+    ],
+    coverage: {
+      enabled: false,
+      reportsDirectory: 'coverage/frontend'
+    }
+  }
+});