feat(cli): instant ESC/Ctrl+X cancellation feedback

[marius-kilocode]

Provides instant visual feedback when pressing ESC or Ctrl+X to cancel tasks. This significantly improves the responsiveness of the CLI for the user when cancelling.

Changes:

• Added optimistic UI state (isCancellingAtom) to show "Cancelling..." immediately
• Reduced escapeCodeTimeout from 500ms to 0ms for instant ESC recognition
• Added 10s safety timeout to prevent stuck state

[changeset-bot]

🦋 Changeset detected

Latest commit: 802de51

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@kilocode/cli	Patch

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[kiloconnect]

✅ No Issues Found

9 files reviewed | Confidence: 95% | Recommendation: Merge

Review Details

Files Reviewed:

• .changeset/cli-esc-cancellation-feedback.md - Changeset entry
• cli/src/state/atoms/__tests__/cancelling.test.ts - New test file
• cli/src/state/atoms/actions.ts - Sets isCancellingAtom in cancelTaskAtom
• cli/src/state/atoms/keyboard.ts - Adds cancelling state on ESC/Ctrl+X
• cli/src/state/atoms/ui.ts - New isCancellingAtom definition
• cli/src/ui/components/StatusIndicator.tsx - UI for cancelling state with safety timeout
• cli/src/ui/components/__tests__/StatusIndicator.test.tsx - Component tests
• cli/src/ui/providers/KeyboardProvider.tsx - escapeCodeTimeout reduced to 0ms
• cli/vitest.config.ts - Added .test.tsx pattern

Checked: Security, bugs, performance, error handling, state management

Notes:

• Clean implementation of optimistic UI pattern for cancellation feedback
• Proper cleanup of timeouts to prevent memory leaks
• Good test coverage for new functionality
• The escapeCodeTimeout=0 change is well-justified in comments - Kitty protocol sequences are sent atomically
• Minor redundancy: isCancellingAtom is set both in keyboard.ts handlers and in cancelTaskAtom, but this is harmless

[kiloconnect]

✅ No Issues Found

9 files reviewed | Confidence: 95% | Recommendation: Merge

Review Details

Files Reviewed:

• .changeset/cli-esc-cancellation-feedback.md - Changeset for patch release
• cli/src/state/atoms/__tests__/cancelling.test.ts - New tests for isCancellingAtom
• cli/src/state/atoms/actions.ts - Sets isCancellingAtom in cancelTaskAtom
• cli/src/state/atoms/keyboard.ts - ESC/Ctrl+X handlers set isCancellingAtom
• cli/src/state/atoms/ui.ts - New isCancellingAtom definition
• cli/src/ui/components/StatusIndicator.tsx - Shows "Cancelling..." with safety timeout
• cli/src/ui/components/__tests__/StatusIndicator.test.tsx - Tests for cancelling UI
• cli/src/ui/providers/KeyboardProvider.tsx - escapeCodeTimeout changed to 0ms
• cli/vitest.config.ts - Added .test.tsx pattern

Checked: Security, bugs, performance, error handling

Notes:

• The isCancellingAtom is set in both keyboard.ts handlers and cancelTaskAtom - this is redundant but harmless (idempotent)
• The 10-second safety timeout is a good defensive measure to prevent stuck UI state
• The escapeCodeTimeout=0 change is safe because Kitty protocol sequences are sent atomically by terminals
• Good test coverage for the new functionality