semi implemented and features implemented save checkpoint

docs/features/unchecked/web/patch-map-explorer.md

@@ -0,0 +1,31 @@
+# Patch Map Explorer (Heatmap UI)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Interactive CSS Grid heatmap showing vendor backport patch coverage across fleet with drill-down to function-level breakdown and paginated affected images. Three API endpoints: aggregated coverage, function-level details, and matching images.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/binary-index/`
+- **Components**:
+  - `binary-index-ops` (`src/Web/StellaOps.Web/src/app/features/binary-index/binary-index-ops.component.ts`)
+  - `patch-map` (`src/Web/StellaOps.Web/src/app/features/binary-index/patch-map.component.ts`)
+- **Source**: SPRINT_20260103_001_FE_preset_pills_patch_map.md
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to `/analyze/patch-map`
+  - [ ] 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)