Migrate to Vue 3

[st3iny]

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Feature request

Is your feature request related to a problem? Please describe. This app is still based on Vue 2 which has been end-of-life for a long time now. It should be migrated to Vue 3.

Describe the solution you'd like The app should be migrated to Vue 3. A concrete plan with actionable steps is still pending.

Describe alternatives you've considered None

Additional context None