Disable chatgxy wizard for anon users

Retrieving and storing responses requires a user id, and anon's don't
have user ids.

Fixes https://github.com/galaxyproject/galaxy/issues/19529

client/src/components/DatasetInformation/DatasetError.vue

@@ -28,7 +28,7 @@ interface Props {
 const props = defineProps<Props>();
 
 const userStore = useUserStore();
-const { currentUser } = storeToRefs(userStore);
+const { currentUser, isAnonymous } = storeToRefs(userStore);
 
 const { renderMarkdown } = useMarkdown({ openLinksInNewPage: true });
 const { config, isConfigLoaded } = useConfig();
@@ -49,7 +49,7 @@ const showForm = computed(() => {
     return noResult || hasError;
 });
 
-const showWizard = computed(() => isConfigLoaded && config.value?.llm_api_configured);
+const showWizard = computed(() => isConfigLoaded && config.value?.llm_api_configured && !isAnonymous.value);
 
 async function getDatasetDetails() {
     datasetLoading.value = true;

lib/galaxy/webapps/galaxy/api/chat.py

@@ -16,11 +16,13 @@ from galaxy.exceptions import ConfigurationError
 from galaxy.managers.chat import ChatManager
 from galaxy.managers.context import ProvidesUserContext
 from galaxy.managers.jobs import JobManager
+from galaxy.model import User
 from galaxy.schema.fields import DecodedDatabaseIdField
 from galaxy.schema.schema import ChatPayload
 from galaxy.webapps.galaxy.api import (
     depends,
     DependsOnTrans,
+    DependsOnUser,
     Router,
 )
 
@@ -57,6 +59,7 @@ class ChatAPI:
         job_id: JobIdPathParam,
         payload: ChatPayload,
         trans: ProvidesUserContext = DependsOnTrans,
+        user: User = DependsOnUser,
     ) -> str:
         """We're off to ask the wizard"""
         # Currently job-based chat exchanges are the only ones supported,
@@ -87,6 +90,7 @@ class ChatAPI:
         job_id: JobIdPathParam,
         feedback: int,
         trans: ProvidesUserContext = DependsOnTrans,
+        user: User = DependsOnUser,
     ) -> Union[int, None]:
         """Provide feedback on the chatbot response."""
         job = self.job_manager.get_accessible_job(trans, job_id)