feat(studio): add organize-imports tool with suggestion review and approval

Adds a Studio 'Organize imports' dialog that groups recently imported
furniture and furniture already sitting in the auto-created import
pages into suggested catalog categories.  Each group is presented with
its suggested name, icon, and layout which can be overridden before
approval; approved groups are turned into real catalog pages in a
single atomic export run.  Offers already inside the import subtree are
moved to the new pages; brand-new furniture gets a fresh offer.

- groupSuggestedCategories: generic pure helper reusing the same
  per-item label heuristic that drives suggestCategoryName; items with
  no label land in a 'Other Furni' remainder bucket
- GET /api/admin/import/organize: returns items from the imported
  furniture tree (catalog_items JOIN items_base via page id set from
  the imported-furniture root) union audit-logged but not-yet-placed
  recent imports; marks alreadyPlaced vs new
- organizeImportFurni server action: validates import-page membership
  before moving any offer, creates pages + inserts/moves items in one
  withCatalogExport snapshot, logs activity
- OrganizeImportsDialog: full-featured Studio dialog with price panel
  (applies to new offers only), parent select, per-group approval,
  editable name/icon/layout with suggestion reset chips, source tags
- import-pages.ts server helper: locates the imported-furniture tree
- Studio nav: 'Organize imports' button with FolderTree icon,
  gated on CATALOG_EDIT, wired next to the catalog manager
- en + nl translations for organizeImports.* keys with ICU plurals
- groupSuggestedCategories unit tests (deterministic grouping,
  remainder handling, size+alpha ordering, label consistency)

src/features/catalog/server/import-pages.ts

@@ -0,0 +1,47 @@
+import "server-only";
+
+import { sql } from "drizzle-orm";
+import { db } from "@/lib/db";
+
+/**
+ * Locate the auto-created "Imported Furniture" tree (caption_save
+ * 'imported_furni' root) and every category sub-page beneath it. These are the
+ * pages the import pipeline fills without review, so the organize-import tool
+ * knows exactly which furniture is "inbox" work.
+ */
+export async function getImportedCategoryPageIds(): Promise<number[]> {
+	const [rows] = (await db.execute(sql`
+    SELECT id FROM catalog_pages
+    WHERE caption_save = 'imported_furni'
+      AND parent_id IN (-1, 0)
+    LIMIT 1
+  `)) as unknown as [Array<{ id: number }>, unknown];
+	const rootId = Number(rows[0]?.id ?? 0);
+	if (!rootId) return [];
+
+	const [childRows] = (await db.execute(sql`
+    SELECT id FROM catalog_pages WHERE parent_id = ${rootId}
+  `)) as unknown as [Array<{ id: number }>, unknown];
+	const children = childRows.map((r) => Number(r.id));
+
+	const pageIds = [rootId, ...children];
+	if (children.length > 0) {
+		const [grandRows] = (await db.execute(sql`
+      SELECT id FROM catalog_pages
+      WHERE parent_id IN (${sql.join(children, sql`, `)})
+    `)) as unknown as [Array<{ id: number }>, unknown];
+		pageIds.push(...grandRows.map((r) => Number(r.id)));
+	}
+	return pageIds;
+}
+
+/** Caption of the imported-furniture root page, when present. */
+export async function getImportedRootCaption(): Promise<string | null> {
+	const [rows] = (await db.execute(sql`
+    SELECT caption FROM catalog_pages
+    WHERE caption_save = 'imported_furni'
+      AND parent_id IN (-1, 0)
+    LIMIT 1
+  `)) as unknown as [Array<{ caption: string }>, unknown];
+	return rows[0]?.caption ?? null;
+}