feat: focus search bar on second tab press (#558)

utils/eventBus.ts

@@ -0,0 +1,26 @@
+type Listener<T = void> = (data?: T) => void;
+
+class EventBus {
+  private listeners: Record<string, Listener<any>[]> = {};
+
+  on<T = void>(event: string, callback: Listener<T>): () => void {
+    if (!this.listeners[event]) {
+      this.listeners[event] = [];
+    }
+    this.listeners[event].push(callback);
+    return () => this.off(event, callback);
+  }
+
+  off<T = void>(event: string, callback: Listener<T>): void {
+    if (!this.listeners[event]) return;
+    this.listeners[event] = this.listeners[event].filter(
+      (fn) => fn !== callback
+    );
+  }
+
+  emit<T = void>(event: string, data?: T): void {
+    this.listeners[event]?.forEach((callback) => callback(data));
+  }
+}
+
+export const eventBus = new EventBus();