♻️(docs-app) Switch from Jest tests to Vitest

We have migrated the testing framework from Jest
to Vitest for the Docs application.
This change includes updates to test files,
configuration files, and the addition of new setup
files for Vitest.

src/frontend/apps/impress/vitest.config.ts

@@ -0,0 +1,25 @@
+/// <reference types="vitest" />
+import react from '@vitejs/plugin-react';
+import tsconfigPaths from 'vite-tsconfig-paths';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  plugins: [
+    react(),
+    tsconfigPaths({
+      root: '.',
+      projects: ['./tsconfig.json'],
+    }),
+  ],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: './vitest.setup.ts',
+    coverage: {
+      provider: 'v8',
+    },
+  },
+  define: {
+    'process.env.NODE_ENV': 'test',
+  },
+});