Hide Classify Uncategorized button when AI categorization is disabled

Also checks that Ollama URL and model are configured before showing
the button, consistent with the settings page behavior.

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

frontend/src/views/transactions/TransactionsView.vue

@@ -4,6 +4,7 @@
       <h1 class="text-h4">Transactions</h1>
       <v-spacer />
       <v-btn
+        v-if="aiEnabled"
         color="info"
         variant="tonal"
         prepend-icon="mdi-brain"
@@ -268,6 +269,7 @@ const editingTxn = ref(false)
 const editingTxnId = ref('')
 const useSplits = ref(false)
 const splits = ref<SplitFormItem[]>([])
+const aiEnabled = ref(false)
 const classifying = ref(false)
 const classifySnackbar = ref(false)
 const classifySnackbarText = ref('')
@@ -319,6 +321,10 @@ onMounted(async () => {
   if (props.id) {
     txnForm.value.accountId = props.id
   }
+  try {
+    const { data } = await aiCategorizationApi.getSettings()
+    aiEnabled.value = data.isEnabled && !!data.ollamaUrl?.trim() && !!data.modelName?.trim()
+  } catch {}
 })
 
 watch(() => props.id, (newId) => {