Implement create custom recommendations

lib/create/api.ts

@@ -118,6 +118,23 @@ async function errorBodyMessage(res: Response): Promise<string> {
   return "Save failed";
 }
 
+/**
+ * Wipe the signed-in user's saved draft. Fire-and-forget: any non-2xx (including
+ * the sync-flag-off `503` and the unauthenticated `401`) is swallowed because
+ * callers only invoke this on already-published / explicitly-discarded flows
+ * where a leftover server draft is acceptable.
+ */
+export async function deleteServerDraft(): Promise<void> {
+  try {
+    await fetch("/api/drafts/me", {
+      method: "DELETE",
+      credentials: "include",
+    });
+  } catch {
+    /* ignore — server draft cleanup is best-effort */
+  }
+}
+
 export async function saveDraftToServer(
   state: CreateFlowState,
 ): Promise<SaveDraftResult> {