refactor dashboard feature boundaries and add test setup

package.json

@@ -10,7 +10,10 @@
         "build": "next build",
         "start": "next start",
         "lint": "next lint",
-        "typecheck": "tsc --noEmit"
+        "typecheck": "tsc --noEmit",
+        "test": "vitest run",
+        "test:watch": "vitest",
+        "test:e2e": "playwright test"
     },
     "dependencies": {
         "@ant-design/icons": "5.3.7",
@@ -27,13 +30,20 @@
         "react-redux": "9.1.2"
     },
     "devDependencies": {
+        "@playwright/test": "^1.49.1",
+        "@testing-library/jest-dom": "^6.6.3",
+        "@testing-library/react": "^16.1.0",
+        "@testing-library/user-event": "^14.5.2",
         "@types/node": "20.19.43",
         "@types/react": "18.3.31",
         "@types/react-dom": "18.3.7",
+        "@vitejs/plugin-react": "^4.3.4",
         "autoprefixer": "10.4.19",
+        "jsdom": "^25.0.1",
         "postcss": "8.4.39",
         "prettier": "3.9.6",
         "tailwindcss": "3.4.6",
-        "typescript": "5.9.3"
+        "typescript": "5.9.3",
+        "vitest": "^3.2.4"
     }
 }