Address review feedback: zod import path and legacy route ref

Use explicit zod/v4 import path in tests, and remove unnecessary
convertLegacyRouteRef wrapper in catalog-graph README.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-plugin-api/src/schema/createPortableSchema.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { z as zodV4 } from 'zod';
+import { z as zodV4 } from 'zod/v4';
 import {
   createConfigSchema,
   mergePortableSchemas,

plugins/catalog-graph/README-alpha.md

@@ -289,7 +289,6 @@ import {
   createFrontendModule,
   PageBlueprint,
 } from '@backstage/frontend-plugin-api';
-import { convertLegacyRouteRef } from '@backstage/core-compat-api';
 import { catalogGraphRouteRef } from '@backstage/plugin-catalog-graph';
 
 export default createFrontendModule({
@@ -298,7 +297,7 @@ export default createFrontendModule({
     PageBlueprint.make({
       params: {
         path: '/catalog-graph',
-        routeRef: convertLegacyRouteRef(catalogGraphRouteRef),
+        routeRef: catalogGraphRouteRef,
         loader: () =>
           import('./components').then(m => <m.CustomEntityRelationsPage />),
       },