semi implemented and features implemented save checkpoint

docs/features/unchecked/web/confidence-breakdown-visualization.md

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+# Confidence Breakdown Visualization (Factor Bar Chart)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## 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)