switch to first category of instrument when instrument is changed

src/App.vue

@@ -1,5 +1,5 @@
 <script setup>
-	import { onMounted, ref } from 'vue'
+	import { watch, onMounted, ref } from 'vue'
 
 	import Summary from './components/summary.vue'
 	import ShowCategory from './components/show_category.vue'
@@ -30,6 +30,12 @@
 		currentWorkingInstrument.value = instruments.value.find(instrument => instrument.name === currentWorkingCategory.value.instrument)
 	}
 	onMounted(loadData)
+
+	watch(currentWorkingInstrument, () => {
+		console.log(currentWorkingCategory);
+		console.log(currentWorkingInstrument);
+		currentWorkingCategory.value = categories.value.find(category => category.instrument === currentWorkingInstrument.value.name)
+	})
 </script>
 
 <template>