Description

In Vue 3 with the Options API, you can declare events emitted by a component using the emits option. This helps with type checking and better tooling support.

export default {
  name: 'WlComponent',
  emits: ['my-event'],
  methods: {
    emitEvent() {
      this.$emit('my-event', 'some data');
    }
  }
}

This is already done in the visualeditor integration components (see example) but not in the Wikifunctions UI components.

Expected behavior (Acceptance criteria):

• All emitted events are declared in their respective components.

Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Front-end_Task/Bug_Completion_Checklist