refactor: let uses of episode finder define custom events and attributes

src/components/episode/AEpisodeFinder.vue

 <template>
-  <FormGroup v-slot="attrs" :label="t('episode.assignment.searchExisting')">
-    <AEpisodeSelector v-model="episodeId" :query="query" :disabled="attrs.disabled" />
+  <FormGroup v-slot="{ disabled }" :label="t('episode.assignment.searchExisting')" custom-control>
+    <AEpisodeSelector v-model="episodeId" :query="query" :disabled="disabled" v-bind="attrs" />
   </FormGroup>
 </template>
 
 <script setup lang="ts">
 import FormGroup from '@/components/generic/FormGroup.vue'
-import { computed } from 'vue'
+import { computed, useAttrs } from 'vue'
 import { Episode, Show } from '@/types'
 import AEpisodeSelector from '@/components/episode/AEpisodeSelector.vue'
 import { useI18n } from '@/i18n'
 
+defineOptions({
+  inheritAttrs: false,
+})
+
 const episodeId = defineModel<Episode['id'] | null>({ required: true })
 const props = defineProps<{
   showId: Show['id']
 }>()
 
 const { t } = useI18n()
+const attrs = useAttrs()
 
 const query = computed(() => ({
   showIds: props.showId,