Method mergeCrossFileEdges

frontend/src/cache.ts:716–737

* Merge new cross-file edges with replace-on-conflict behavior * Newer edges (by timestamp) replace older ones, preserving latest labels

(newEdges: CrossFileEdge[])

     * Newer edges (by timestamp) replace older ones, preserving latest labels
     */
    private mergeCrossFileEdges(newEdges: CrossFileEdge[]) {
        const edgeKey = (e: CrossFileEdge) =>
            `${e.sourceFile}:${e.sourceNodeId}->${e.targetFile}:${e.targetNodeId}`;

        // Build map from existing edges
        const edgeMap = new Map<string, CrossFileEdge>();
        for (const edge of this.crossFileEdges) {
            edgeMap.set(edgeKey(edge), edge);
        }

        // Merge new edges - replace if newer timestamp
        for (const edge of newEdges) {
            const key = edgeKey(edge);
            const existing = edgeMap.get(key);
            if (!existing || edge.timestamp > existing.timestamp) {
                edgeMap.set(key, edge);
            }
        }

        // Convert back to array
        this.crossFileEdges = Array.from(edgeMap.values());
    }

    // =========================================================================
    // Retrieve & Merge