feat(admin): reorganize housekeeping and strengthen shared workflows

src/lib/admin-table-state.ts

@@ -0,0 +1,6 @@
+/** A centered, bounded window including the current page, also at either end. */
+export function tablePageNumbers(page: number, last: number): number[] {
+	const count = Math.min(5, Math.max(1, last));
+	const start = Math.max(1, Math.min(page - 2, last - count + 1));
+	return Array.from({ length: count }, (_, index) => start + index);
+}