feat(ui): Implement core layout with Sidebar and MainLayout

frontend/vite.config.ts

@@ -1,3 +1,4 @@
+/// <reference types="vitest" />
 import path from "path"
 import tailwindcss from "@tailwindcss/vite"
 import react from "@vitejs/plugin-react"
@@ -11,4 +12,9 @@ export default defineConfig({
       "@": path.resolve(__dirname, "./src"),
     },
   },
+  test: {
+    globals: true,
+    environment: "jsdom",
+    setupFiles: "./src/test/setup.ts",
+  },
 })