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git.stella-ops.org/docs/features/unchecked/web/firstsignalcard-component.md

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# FirstSignalCard Component (Prefetch, SSE Updates, Storybook)
## Module
Web
## Status
IMPLEMENTED
## 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)