feat(coding-agent): add configurable working indicator closes #3413

packages/coding-agent/src/core/extensions/runner.ts

@@ -167,8 +167,8 @@ export type ShutdownHandler = () => void;
  * Helper function to emit session_shutdown event to extensions.
  * Returns true if the event was emitted, false if there were no handlers.
  */
-export async function emitSessionShutdownEvent(extensionRunner: ExtensionRunner | undefined): Promise<boolean> {
-	if (extensionRunner?.hasHandlers("session_shutdown")) {
+export async function emitSessionShutdownEvent(extensionRunner: ExtensionRunner): Promise<boolean> {
+	if (extensionRunner.hasHandlers("session_shutdown")) {
 		await extensionRunner.emit({
 			type: "session_shutdown",
 		});
@@ -185,6 +185,7 @@ const noOpUIContext: ExtensionUIContext = {
 	onTerminalInput: () => () => {},
 	setStatus: () => {},
 	setWorkingMessage: () => {},
+	setWorkingIndicator: () => {},
 	setHiddenThinkingLabel: () => {},
 	setWidget: () => {},
 	setFooter: () => {},