chore: update package management from yarn to npm

Remove unused dependencies from package.json and switch 
the project’s package manager from Yarn to NPM. This 
enhances compatibility with NPM-based workflows and 
reduces conflicts by ensuring consistent installs through 
npm ci. Additionally, update the Pinia plugin to a newer 
version for better performance and functionality.

store/index.ts

@@ -46,6 +46,7 @@ export const useState = defineStore(
   },
   {
     persist: {
+      storage: localStorage,
       key: 'dancefinder_state',
     },
   },