fix(sidebar): align group selection with visible tree

apps/desktop/src/lib/sidebar/sidebarLayout.ts

@@ -449,6 +449,42 @@ export function connectionIdsInGroups(layout: SidebarLayout, groupIds: Iterable<
   return connectionIds;
 }
 
+/** 收集单个分组下的所有连接 ID（含嵌套子分组），供分组勾选框级联选中连接使用。 */
+export function connectionIdsUnderGroup(layout: SidebarLayout, groupId: string): string[] {
+  return connectionIdsInGroups(layout, [groupId]);
+}
+
+/** 收集分组自身及其下属所有含连接的子分组 ID，供级联选中时自动展开使用。 */
+export function connectionBearingGroupIdsUnder(layout: SidebarLayout, groupId: string): string[] {
+  const entry = findGroupEntry(layout.order, groupId);
+  if (!entry) return [];
+  const ids: string[] = [];
+  const visit = (groupEntry: Extract<SidebarOrderEntry, { type: "group" }>): boolean => {
+    let hasConnection = false;
+    for (const child of entryChildren(groupEntry)) {
+      if (child.type === "connection") hasConnection = true;
+      else if (visit(child)) hasConnection = true;
+    }
+    if (hasConnection) ids.push(groupEntry.id);
+    return hasConnection;
+  };
+  visit(entry);
+  return ids;
+}
+
+/** 批量展开指定分组（collapsed 置为 false），无变化时返回原布局。 */
+export function expandGroups(layout: SidebarLayout, groupIds: Iterable<string>): SidebarLayout {
+  const targets = new Set(groupIds);
+  if (!targets.size) return layout;
+  let changed = false;
+  const groups = layout.groups.map((group) => {
+    if (!targets.has(group.id) || !group.collapsed) return group;
+    changed = true;
+    return { ...group, collapsed: false };
+  });
+  return changed ? { ...layout, groups } : layout;
+}
+
 export function deleteGroups(layout: SidebarLayout, groupIds: Iterable<string>): SidebarLayout {
   const targets = new Set(groupIds);
   if (!targets.size) return layout;

apps/desktop/src/lib/sidebar/sidebarTreeContext.ts

@@ -4,6 +4,7 @@ import type { TreeNode } from "@/types/database";
 export interface SidebarTreeContext {
   getVisibleNodes: () => TreeNode[];
   getVisibleNodeIndex: (id: string) => number;
+  getProjectedConnectionIds?: () => ReadonlySet<string> | null;
   isSearchProjectionActive?: () => boolean;
   getTreeLoadSearchOptions?: (node: TreeNode) => { searchFilter: string; allowGlobalSearchMismatch: true; expectedSidebarSearchQuery: string } | undefined;
   setTableSearchQuery?: (parentNodeId: string, query: string, local: boolean) => void;