With 742783: bridge: Switch to Vue3 compat merged, Wikidata Bridge is now using the Vue 3 compatibility build. Using the app throws a number of deprecation warnings in the console. These need to be fixed, before we can build bridge with the standard Vue 3 implementation.

acceptance criteria

• No Vue deprecation warnings are being thrown anymore
• Bridge is being built with the standard Vue 3 implementation
• The @vue/compat dependency has been removed from bridge
• any related compatibility code has been removed, such as compatConfig: { MODE: 2, },