feat(core): Introduce message bus for tool execution confirmation (#11544)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/core/src/utils/errors.ts

@@ -70,6 +70,13 @@ export class FatalCancellationError extends FatalError {
   }
 }
 
+export class CanceledError extends Error {
+  constructor(message = 'The operation was canceled.') {
+    super(message);
+    this.name = 'CanceledError';
+  }
+}
+
 export class ForbiddenError extends Error {}
 export class UnauthorizedError extends Error {}
 export class BadRequestError extends Error {}