# FirstSignalCard Component (Prefetch, SSE Updates, Storybook)

## Module
Web

## Status
VERIFIED

## Description
FirstSignalCard Angular component with prefetch service for fast initial signal delivery, signal store, API client, SSE updates showing summary + next action buttons, Storybook stories, and unit tests.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/runs/`
- **Components**:
  - `first-signal-card` (`src/Web/StellaOps.Web/src/app/features/runs/components/first-signal-card/first-signal-card.component.ts`)
- **Services**:
  - `first-signal-prefetch` (`src/Web/StellaOps.Web/src/app/features/runs/services/first-signal-prefetch.service.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)

## Verification
- Run: `docs/qa/feature-checks/runs/web/firstsignalcard-component/run-001/`
- Tier 0 (source): pass (`tier0-source-check.json`)
- Tier 1 (build/tests): pass (`tier1-build-check.json`)
- Tier 2 (behavior): pass (`tier2-e2e-check.json`)
- Verified on (UTC): 2026-02-11