fix(app): stop other youtube embeds when one starts playing (#2642)

fluxer_app/src/features/messaging/state/ActiveIframeEmbed.ts

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import {makeAutoObservable} from 'mobx';
+
+class ActiveIframeEmbed {
+	activeId: string | null = null;
+
+	constructor() {
+		makeAutoObservable(this, {}, {autoBind: true});
+	}
+
+	isActive(id: string): boolean {
+		return this.activeId === id;
+	}
+
+	claim(id: string): void {
+		this.activeId = id;
+	}
+
+	release(id: string): void {
+		if (this.activeId === id) {
+			this.activeId = null;
+		}
+	}
+}
+
+export default new ActiveIframeEmbed();