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git.stella-ops.org/docs/features/unchecked/web/smart-diff-ui-components.md

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# Smart-Diff UI Components (Visual Diffs)
## Module
Web
## Status
IMPLEMENTED
## Description
Full visual diff UI with three-pane layout (categories, items, proof), delta summary strip, compare view, VEX merge explanation visualization, proof pane, export actions, and smart-diff badges. Matches the advisory's specified UI patterns.
## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/components/smart-diff-badge/`
- **Components**:
- `smart-diff-badge` (`src/Web/StellaOps.Web/src/app/shared/components/smart-diff-badge/smart-diff-badge.component.ts`)
- **Source**: Feature matrix scan
## E2E Test Plan
- **Setup**:
- [ ] Log in with a user that has appropriate permissions
- [ ] Navigate to the relevant page/section where this feature appears
- [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
- **Core verification**:
- [ ] Verify side-by-side comparison view renders correctly with two versions
- [ ] Verify additions, removals, and changes are visually highlighted
- [ ] Verify diff data matches the expected delta between versions
- **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)