semi implemented and features implemented save checkpoint

docs/features/unchecked/web/evidence-thread-browser.md

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+# Evidence Thread Browser (Artifact Evidence Lineage)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Browse and inspect evidence threads per artifact digest. List view shows all evidence threads; detail view shows the full thread of evidence for a specific artifact including all linked attestations, proofs, and verification results.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/evidence-thread/`
+- **Routes**: `evidence-thread.routes.ts`
+- **Components**:
+  - `evidence-export-dialog` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-export-dialog/evidence-export-dialog.component.ts`)
+  - `evidence-graph-panel` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-graph-panel/evidence-graph-panel.component.ts`)
+  - `evidence-node-card` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-node-card/evidence-node-card.component.ts`)
+  - `evidence-thread-list` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-thread-list/evidence-thread-list.component.ts`)
+  - `evidence-thread-view` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-thread-view/evidence-thread-view.component.ts`)
+  - `evidence-timeline-panel` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-timeline-panel/evidence-timeline-panel.component.ts`)
+  - `evidence-transcript-panel` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-transcript-panel/evidence-transcript-panel.component.ts`)
+- **Services**:
+  - `evidence-thread` (`src/Web/StellaOps.Web/src/app/features/evidence-thread/services/evidence-thread.service.ts`)
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to `/evidence`
+  - [ ] 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)