# Confidence Breakdown Visualization (Factor Bar Chart)

## Module
Web

## Status
VERIFIED

## Description
Visual bar chart breakdown showing how each evidence factor (SBOM, VEX, reachability, binary analysis, attestation) contributes to the overall confidence score. Includes per-factor chip components with drill-down capability.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/components/visualization/`
- **Components**:
  - `graphviz-renderer` (`src/Web/StellaOps.Web/src/app/shared/components/visualization/graphviz-renderer.component.ts`)
  - `mermaid-renderer` (`src/Web/StellaOps.Web/src/app/shared/components/visualization/mermaid-renderer.component.ts`)
- **Source**: SPRINT_20251229_001_004_FE_proof_studio.md

## 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 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)

## Verification
- Date: 2026-02-10
- Run artifacts: docs/qa/feature-checks/runs/web/confidence-breakdown-visualization/run-001/
- Tier results:
  - tier0-source-check.json: pass
  - tier1-build-check.json: pass
  - tier2-e2e-check.json: pass