save checkpoint: save features

docs/features/checked/web/node-diff-table-component.md

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+# Node Diff Table Component (Tabular SBOM Change Comparison)
+
+## Module
+Web
+
+## Status
+VERIFIED
+
+## Description
+Tabular SBOM component-change diff view with change-type filter chips, debounced search, multi-column sorting, row selection with bulk actions, pagination, clipboard actions, and CSV export for lineage comparisons.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/lineage/components/node-diff-table/`
+- **Primary component**:
+  - `diff-table.component.ts`
+  - `diff-table.component.html`
+  - `diff-table.component.scss`
+  - `models/diff-table.models.ts`
+- **Service dependency**:
+  - `src/Web/StellaOps.Web/src/app/features/lineage/services/lineage-graph.service.ts`
+- **Behavioral tests**:
+  - `src/Web/StellaOps.Web/src/tests/lineage/node-diff-table-component.spec.ts`
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to lineage comparison workflow hosting the node diff table
+  - [ ] Ensure comparison data exists (added/removed/changed components)
+- **Core verification**:
+  - [ ] Verify component rows render and sort deterministically
+  - [ ] Verify search is debounced and filter chips (including both-changed) work
+  - [ ] Verify bulk actions, pagination, and API-input based diff fetch behavior
+- **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/node-diff-table-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): `2026-02-11T09:03:08.3546412Z`