Function loadChildren

frontend/app/treeview/treeview.tsx:284–335

(id: string)

    );

    const loadChildren = async (id: string) => {
        const currentNode = nodesById.get(id);
        if (currentNode == null || !currentNode.isDirectory || currentNode.notfound || currentNode.staterror || fetchDir == null) {
            return;
        }
        const status = currentNode.childrenStatus ?? "unloaded";
        if (status !== "unloaded") {
            return;
        }
        setNodesById((prev) => {
            const next = new Map(prev);
            next.set(id, { ...currentNode, childrenStatus: "loading" });
            return next;
        });
        try {
            const result = await fetchDir(id, maxDirEntries);
            setNodesById((prev) => {
                const next = new Map(prev);
                result.nodes.forEach((node) => {
                    const merged: TreeNodeData = {
                        ...node,
                        parentId: node.parentId ?? id,
                        childrenStatus: node.childrenStatus ?? (node.isDirectory ? "unloaded" : "loaded"),
                    };
                    next.set(merged.id, merged);
                });
                const childrenIds = sortIdsByNode(
                    next,
                    result.nodes.map((entry) => entry.id)
                );
                const source = next.get(id) ?? currentNode;
                next.set(id, {
                    ...source,
                    childrenIds,
                    childrenStatus: result.capped ? "capped" : "loaded",
                    capInfo: result.capped ? { max: maxDirEntries, totalKnown: result.totalKnown } : undefined,
                });
                return next;
            });
        } catch (error) {
            setNodesById((prev) => {
                const next = new Map(prev);
                const source = next.get(id) ?? currentNode;
                next.set(id, {
                    ...source,
                    childrenStatus: "error",
                    staterror: error instanceof Error ? error.message : "Unknown error",
                });
                return next;
            });
        }
    };

    const toggleExpand = (id: string) => {
        const node = nodesById.get(id);