rename web/ to admin/, along with the web-named build and cli identifiers

admin/src/lib/defaultGroup.ts

@@ -0,0 +1,13 @@
+import type { Group } from "@/lib/types";
+
+/** The seeded group every client falls back to; the API forbids renaming or deleting it. */
+export const DEFAULT_GROUP_ID = 1;
+
+/**
+ * The group a form preselects. The list arrives ordered by name
+ * (groups_repo.zig), so `groups[0]` is the alphabetically first group, not the
+ * default — it is only the fallback for a list that lost the seeded group.
+ */
+export function defaultGroupId(groups: readonly Group[]): number {
+	return groups.find((group) => group.id === DEFAULT_GROUP_ID)?.id ?? groups[0]?.id ?? DEFAULT_GROUP_ID;
+}