# Workflow Visualization with Time-Travel Controls

## Module
Web

## Status
IMPLEMENTED

## Description
DAG-based workflow visualizer with time-travel debugging controls. Users can step forward/backward through workflow execution states, inspect step details at each point in time, view execution logs, and interactively debug release workflows. The time-travel service manages historical state snapshots. (Merged with Workflow Visualization UI Module from Phase 2 Web section.)

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/workflow-visualization/`
- **Routes**: `workflow-visualization.routes.ts`
- **Components**:
  - `step-detail-panel` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/step-detail-panel/step-detail-panel.component.ts`)
  - `time-travel-controls` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/time-travel-controls/time-travel-controls.component.ts`)
  - `workflow-visualizer` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/workflow-visualizer/workflow-visualizer.component.ts`)
- **Services**:
  - `time-travel` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/services/time-travel.service.ts`)
  - `workflow-visualization` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/services/workflow-visualization.service.ts`)
- **Source**: Feature matrix scan

## E2E Test Plan
- **Setup**:
  - [ ] Log in with a user that has appropriate permissions
  - [ ] Navigate to `/release-orchestrator`
  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
- **Core verification**:
  - [ ] Verify the visualization renders correctly with sample data
  - [ ] Verify interactive elements (hover tooltips, click-to-drill-down) work
  - [ ] Verify the visualization handles empty/minimal data gracefully
- **Edge cases**:
  - [ ] Verify graceful handling when backend API is unavailable (error state)
  - [ ] Verify responsive layout at different viewport sizes
  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)