Add composer api implementation

apps/web/src/modules/ComposerApi.ts

@@ -0,0 +1,23 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { type ComposerApi as ModuleComposerApi } from "@element-hq/element-web-module-api";
+
+import defaultDispatcher from "../dispatcher/dispatcher";
+import { Action } from "../dispatcher/actions";
+import type { ComposerInsertPayload } from "../dispatcher/payloads/ComposerInsertPayload";
+import { TimelineRenderingType } from "../contexts/RoomContext";
+
+export class ComposerApi implements ModuleComposerApi {
+    public insertTextIntoComposer(text: string): void {
+        defaultDispatcher.dispatch({
+            action: Action.ComposerInsert,
+            text,
+            timelineRenderingType: TimelineRenderingType.Room,
+        } satisfies ComposerInsertPayload);
+    }
+}