Add explain analysis workflow and UI

frontend/package.json

@@ -7,6 +7,8 @@
     "dev": "vite",
     "build": "vite build",
     "lint": "eslint .",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "preview": "vite preview",
     "preview:host": "vite preview --host"
   },
@@ -37,6 +39,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.33.0",
+    "@testing-library/react": "^16.3.2",
     "@types/react": "^19.1.13",
     "@types/react-dom": "^19.1.9",
     "@vitejs/plugin-react": "^5.0.0",
@@ -45,11 +48,13 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.20",
     "globals": "^16.3.0",
+    "jsdom": "^29.0.0",
     "postcss": "^8.5.6",
     "tailwindcss": "^3.4.17",
     "tailwindcss-animate": "^1.0.7",
     "typescript": "^5.9.2",
     "vite": "^7.1.2",
-    "vite-tsconfig-paths": "^5.1.4"
+    "vite-tsconfig-paths": "^5.1.4",
+    "vitest": "^4.1.0"
   }
 }