fix(core): drill-down lists descendants under untracked intermediates

listEntries({ parentId: X }) now applies the top-level rule relative to X: this user's
live entries on descendants of X (up to three levels) with no live-entry work strictly
between them and X, so it agrees with childSummary. Restoring an engagement's re-parenting
onto a soft-deleted entry throws ValidationError("entryId", "target entry is deleted").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/src/entries.ts

@@ -730,6 +730,21 @@ const HAS_ENTRY_ANCESTOR = sql<boolean>`exists (select 1 from works a1
     and (pe.work_id = a1.id or pe.work_id = a2.id or pe.work_id = a3.id)
   where a1.id = w.parent_id)`;
 
+/**
+ * True when the entry's work is a descendant of `parentId` (up to three levels) with no work strictly
+ * between them carrying a live entry of this user: the top-level rule, relative to `parentId`.
+ */
+function underParent(parentId: string) {
+  const liveEntryOn = (ids: ReturnType<typeof sql>) =>
+    sql`exists (select 1 from entries pe where pe.user_id = e.user_id and pe.deleted_at is null and pe.work_id in (${ids}))`;
+  return sql<boolean>`(w.parent_id = ${parentId}
+    or exists (select 1 from works p1 where p1.id = w.parent_id and p1.parent_id = ${parentId}
+      and not ${liveEntryOn(sql`p1.id`)})
+    or exists (select 1 from works p1 inner join works p2 on p2.id = p1.parent_id
+      where p1.id = w.parent_id and p2.parent_id = ${parentId}
+      and not ${liveEntryOn(sql`p1.id, p2.id`)}))`;
+}
+
 function viewQuery(k: Executor, userId: string) {
   return k
     .selectFrom("entries as e")
@@ -801,7 +816,8 @@ export interface EntryFilter {
   q?: string;
   /**
    * Default `null`: the top of the user's library, i.e. entries with no ancestor work (up to three
-   * levels) carrying a live entry of this user. A work id lists that work's direct children.
+   * levels) carrying a live entry of this user. A work id applies the same rule relative to that work:
+   * its descendants (up to three levels) with no live-entry work strictly between them and it.
    */
   parentId?: string | null;
   sort?: "updated" | "title" | "rating";
@@ -829,7 +845,7 @@ export async function listEntries(
 
   let q = viewQuery(db.k, userId);
   const parentId = filter.parentId === undefined ? null : filter.parentId;
-  q = parentId === null ? q.where(sql<boolean>`not ${HAS_ENTRY_ANCESTOR}`) : q.where("w.parent_id", "=", parentId);
+  q = q.where(parentId === null ? sql<boolean>`not ${HAS_ENTRY_ANCESTOR}` : underParent(parentId));
   if (filter.mediaType) q = q.where(sql<string>`coalesce(e.media_type_override, w.media_type)`, "=", filter.mediaType);
   if (filter.status) q = q.where("e.status", "=", filter.status);
   if (filter.tag) {