chore(frontend): exclude e2e/ from Vitest discovery

frontend/vite.config.ts

@@ -24,5 +24,7 @@ export default defineConfig({
     globals: true,
     setupFiles: ["./src/test-setup.ts"],
     css: false,
+    include: ["src/**/*.{test,spec}.{ts,tsx}"],
+    exclude: ["e2e/**", "node_modules/**", "dist/**"],
   },
 });