fix(agent): stop tool preflight after extension abort

closes #4276

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -1478,6 +1478,9 @@ export class InteractiveMode {
 		const uiContext = this.createExtensionUIContext();
 		await this.session.bindExtensions({
 			uiContext,
+			abortHandler: () => {
+				this.restoreQueuedMessagesToEditor({ abort: true });
+			},
 			commandContextActions: {
 				waitForIdle: () => this.session.agent.waitForIdle(),
 				newSession: async (options) => {
@@ -1627,7 +1630,9 @@ export class InteractiveMode {
 			model: this.session.model,
 			isIdle: () => !this.session.isStreaming,
 			signal: this.session.agent.signal,
-			abort: () => this.session.abort(),
+			abort: () => {
+				this.restoreQueuedMessagesToEditor({ abort: true });
+			},
 			hasPendingMessages: () => this.session.pendingMessageCount > 0,
 			shutdown: () => {
 				this.shutdownRequested = true;