first commit

testmulticomponent/components/ComponentB.js

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+// components/ComponentB.js
+
+const ComponentB = {
+    template: `
+      <div>
+        <h2>Component B</h2>
+        <p>Data: {{ data }}</p>
+        <v-btn @click="fetchData">Fetch Data</v-btn>
+      </div>
+    `,
+    computed: {
+      data() {
+        return this.$store.state.data;
+      }
+    },
+    methods: {
+      async fetchData() {
+        await this.$store.dispatch('fetchData');
+      }
+    }
+  };
+