chore: add tests

package.json

@@ -70,6 +70,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.28.5",
+    "@pinia/testing": "^1.0.3",
     "@tailwindcss/typography": "^0.5.19",
     "@types/fontfaceobserver": "^2.1.3",
     "@types/markdown-it": "^14.1.2",
@@ -79,6 +80,7 @@
     "@vite-pwa/assets-generator": "^1.0.2",
     "@vitejs/plugin-vue": "^5.2.4",
     "@vue/compiler-sfc": "^3.5.28",
+    "@vue/test-utils": "^2.4.11",
     "autoprefixer": "^10.4.24",
     "daisyui": "^5.5.18",
     "dotenv": "^17.2.3",
@@ -86,6 +88,7 @@
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "eslint-plugin-unused-imports": "^4.4.1",
     "esno": "^4.8.0",
+    "jsdom": "^29.1.1",
     "oxfmt": "^0.42.0",
     "oxlint": "^1.57.0",
     "prettier": "^3.8.1",