feat: consume activity processed SSE

src/activity/useActivitiesProcessed.ts

@@ -0,0 +1,8 @@
+import {onUnmounted} from "vue";
+import {onActivitiesProcessed} from "./activitiesProcessed";
+
+export const useActivitiesProcessed = (listener: () => void): (() => void) => {
+    const unsubscribe = onActivitiesProcessed(listener);
+    onUnmounted(unsubscribe);
+    return unsubscribe;
+};