refactor(web): extract groupDefinitions helper; object-detail uses it (#45)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/lib/group-fields.ts

@@ -0,0 +1,30 @@
+import type { components } from "../api/schema";
+
+type FieldDefinitionView = components["schemas"]["FieldDefinitionView"];
+
+export type FieldGroup = { group: string; defs: FieldDefinitionView[] };
+
+/** Group field definitions by `def.group` (trimmed), preserving definition order
+ *  within and across groups; ungrouped defs fall into a trailing `otherLabel` bucket. */
+export function groupDefinitions(
+  definitions: FieldDefinitionView[],
+  otherLabel: string,
+): FieldGroup[] {
+  const groups: FieldGroup[] = [];
+
+  for (const def of definitions) {
+    const group = def.group?.trim() ? def.group : otherLabel;
+    let bucket = groups.find((g) => g.group === group);
+
+    if (!bucket) {
+      bucket = { group, defs: [] };
+      groups.push(bucket);
+    }
+
+    bucket.defs.push(def);
+  }
+
+  groups.sort((a, b) => Number(a.group === otherLabel) - Number(b.group === otherLabel));
+
+  return groups;
+}