[Fix] UI - Policies: Type accuracy and mutation guard for usePolicyVersions

- Make PolicyVersionsResponse.versions optional (Policy[] | undefined)
  to match real API shape — select fallback handles normalization
- Add policyName guard to useUpdatePolicyVersionStatus mutationFn
  to fail loudly instead of silently skipping cache invalidation
- Add test for null policyName in updateStatus mutation

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

ui/litellm-dashboard/src/app/(dashboard)/hooks/policies/usePolicyVersions.test.ts

@@ -304,4 +304,15 @@ describe("useUpdatePolicyVersionStatus", () => {
       "Failed to promote to production: Not found"
     );
   });
+
+  it("throws when policyName is null", async () => {
+    const { result } = renderHook(
+      () => useUpdatePolicyVersionStatus(null),
+      { wrapper }
+    );
+
+    await expect(
+      result.current.mutateAsync({ policyId: "v2", status: "published" })
+    ).rejects.toThrow("Missing access token or policy name");
+  });
 });

ui/litellm-dashboard/src/app/(dashboard)/hooks/policies/usePolicyVersions.ts

@@ -17,7 +17,7 @@ export const policyVersionKeys = createQueryKeys("policyVersions");
 
 export interface PolicyVersionsResponse {
   policy_name: string;
-  versions: Policy[];
+  versions: Policy[] | undefined;
   total_count: number;
 }
 
@@ -95,8 +95,8 @@ export const useUpdatePolicyVersionStatus = (
     { policyId: string; status: "published" | "production" }
   >({
     mutationFn: async ({ policyId, status }) => {
-      if (!accessToken) {
-        throw new Error("Missing access token");
+      if (!accessToken || !policyName) {
+        throw new Error("Missing access token or policy name");
       }
       return await updatePolicyVersionStatus(accessToken, policyId, status);
     },