# Smart-Diff UI Components (Visual Diffs)

## Module
Web

## Status
VERIFIED

## 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)

## Verification
- Verified on 2026-02-11 via `docs/qa/feature-checks/runs/web/smart-diff-ui-components/run-001/`.
- Tier 0 confirmed SmartDiff badge component/export assets and key rule metadata symbols.
- Tier 1 passed focused Angular behavior regression (15 files / 69 tests) and `npm run build`.
- Tier 2 validated SmartDiff rule metadata mapping, single-rule/severity rendering, and compact multi-rule icon behavior.