- Introduced SubmittedUserInput type to track submission state including cancelled and started flags. Added startPendingSubmission, cancelPendingSubmission, markPendingSubmissionStarted, and finishPendingSubmission methods to manage the lifecycle of user input submissions. Enhanced escape key handling to prioritize canceling pending optimistic submissions before aborting active sessions.
- Extracted loading animation lifecycle management into centralized ensureLoadingAnimation() method.
- Consolidated duplicate loading animation setup across event-controller and interactive-mode into single reusable method.
- Updated showError() to properly clean up loading animation state when errors occur.
- Added comprehensive test coverage for InputController escape key behavior with optimistic submission.
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