* fix router and move graph related parts to GraphView.vue
* (fix) add back child element in UnloadWindowConfirmDialog
* (cleanup) remove empty callback
* (fix) index.html formating for prettier
* (add) proper icon management
- on-demand icons auto importing
- handle all available icon sets (https://icones.js.org)
* (fix) proper css management
* (add) front stack improvement:
- implement vue router
- prepare for App.vue simplification
- proper management of views and layouts
- fix Tailwind CSS and prepare for overall css cleaning
* (fix) move back user.css to public dir
* (fix) remove user.css import from main.ts
