update vitest setup, and collect coverage

packages/@n8n/chat/vitest.config.mts

@@ -0,0 +1,30 @@
+import { resolve } from 'path';
+import { mergeConfig } from 'vite';
+import { type UserConfig } from 'vitest';
+import { defineConfig } from 'vitest/config';
+import viteConfig from './vite.config.mts';
+
+const srcPath = resolve(__dirname, 'src');
+const vitestConfig = defineConfig({
+	test: {
+		globals: true,
+		environment: 'jsdom',
+		root: srcPath,
+		setupFiles: ['./src/__tests__/setup.ts'],
+		...(process.env.COVERAGE_ENABLED === 'true'
+			? {
+					coverage: {
+						enabled: true,
+						provider: 'v8',
+						reporter: process.env.CI === 'true' ? 'cobertura' : 'text-summary',
+						all: true,
+					},
+			  }
+			: {}),
+	},
+}) as UserConfig;
+
+export default mergeConfig(
+	viteConfig,
+	vitestConfig,
+);