fix(acadenice): filter undefined pageIds before sql.lit() in graph — Patch 030

loadPageMeta logged 'invalid immediate value undefined' on every graph
request. Cause: when an edge row has a null source/target_page_id (rare,
but happens during partial backlink reindex), the resulting finalPageIds
set carries undefined entries, and sql.lit(undefined) rejects.

Filter cleanIds to string-only and return early if empty. The catch
block stays as a safety net for unrelated SQL errors.

Verified via curl: GET /api/acadenice/graph now returns 200 with no
ERROR log line.

Patch 030.

apps/server/src/core/acadenice/graph/services/graph.service.ts

@@ -424,10 +424,17 @@ export class GraphService {
     pageIds: string[],
     spaceId: string | undefined,
   ): Promise<PageMetaRow[]> {
-    if (pageIds.length === 0) return [];
+    // Filter out undefined / null / empty entries before binding — sql.lit
+    // throws "invalid immediate value undefined" otherwise. Edges with a
+    // missing source/target page id would surface here when finalPageIds is
+    // assembled from raw rows.
+    const cleanIds = pageIds.filter(
+      (id): id is string => typeof id === 'string' && id.length > 0,
+    );
+    if (cleanIds.length === 0) return [];
 
     try {
-      const idList = sql.join(pageIds.map((id) => sql.lit(id)));
+      const idList = sql.join(cleanIds.map((id) => sql.lit(id)));
       const spaceFilter = spaceId ? sql`AND sp.id = ${spaceId}` : sql``;
 
       const rows = await sql<PageMetaRow>`