Nextcloud library [@nextcloud/vue](https://github.com/nextcloud-libraries/nextcloud-vue?tab=readme-ov-file#-documentation) supports vue2 from version 9. Once the version is released, we want to migrate the integration\_app code to vue3 as well

Component docs: [https://next--nextcloud-vue-components.netlify.app/](https://next--nextcloud-vue-components.netlify.app/)

Open tasks:

* bump `@nextcloud/vue`

* bump vue to version 3

* migrate vue2 code to vue3 Begin of the insertion


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### Testing Steps

1. UI elements are OK: clickable, visible

2. No obvious UI issuesEnd of the insertion