refactor: 프론트엔드 리펙토링

src/features/local-draft-feature/domain/local-draft.ts

@@ -0,0 +1,21 @@
+export type LocalDraft = Readonly<{
+  draftId: string;
+  title: string;
+  body: string;
+}>;
+
+export function createLocalDraft(values: LocalDraft): LocalDraft {
+  const draftId = values.draftId.trim();
+  const title = values.title.trim();
+  if (!draftId || !title) {
+    throw new TypeError("Local draft requires draftId and title");
+  }
+  if (title.length > 160 || values.body.length > 100_000) {
+    throw new TypeError("Local draft exceeds bounded field limits");
+  }
+  return Object.freeze({
+    draftId,
+    title,
+    body: values.body,
+  });
+}