chore: Fix storybook coverage

package.json

@@ -71,6 +71,7 @@
     "@eslint/js": "^9.39.2",
     "@jest/globals": "^30.2.0",
     "@storybook/addon-a11y": "^8.6.15",
+    "@storybook/addon-coverage": "^3.0.0",
     "@storybook/addon-essentials": "^8.6.15",
     "@storybook/addon-interactions": "^8.6.15",
     "@storybook/addon-themes": "^8.6.15",
@@ -112,6 +113,7 @@
     "typescript": "^5.8.3",
     "typescript-eslint": "^8.31.1",
     "vite": "^7.2.2",
+    "vite-plugin-istanbul": "^7.2.1",
     "wait-on": "^8.0.3"
   }
 }