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git.stella-ops.org/docs/features/unchecked/web/vex-merge-panel-three-column-layout.md

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# VEX Merge Panel Three-Column Layout
## Module
Web
## Status
IMPLEMENTED
## Description
Three-column VEX merge panel (source A / merged result / source B) with inline conflict resolution, lattice-based merge visualization, and trust provenance annotations. Enhances the existing VEX merge workflow with side-by-side comparison.
## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/vex-studio/components/vex-merge-panel/`
- **Components**:
- `vex-merge-panel` (`src/Web/StellaOps.Web/src/app/features/vex-studio/components/vex-merge-panel/vex-merge-panel.component.ts`)
- **Source**: batch_38/file_16.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 panel/drawer opens on trigger (click, keyboard shortcut)
- [ ] Verify the panel displays the correct detail data for the selected item
- [ ] Verify the panel can be closed (X button, Escape key, backdrop click)
- **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)