# Evidence Presentation UX (Panels, Drawers, Rail, Export Center)

## Module
Web

## Status
IMPLEMENTED

## Description
Comprehensive evidence presentation: tabbed panels across triage/findings/SBOM/policy views with reachability, binary diff, provenance, policy, and attestation chain tabs. Per-finding evidence drawer, right-rail proof pane with witness path call traces, DSSE badges, confidence meters. Evidence export center with audit bundle creation. TTE metrics tracking.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/components/evidence-drawer/`
- **Components**:
  - `evidence-drawer` (`src/Web/StellaOps.Web/src/app/shared/components/evidence-drawer/evidence-drawer.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 the component renders correctly with sample data
  - [ ] Verify interactive elements respond to user input
  - [ ] Verify data is fetched and displayed from the correct API endpoints
- **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)