fix: add model to provider

src/app/(dashboard)/dashboard/providers/[id]/page.js

@@ -11,6 +11,7 @@ import { getModelsByProviderId, getModelKind } from "@/shared/constants/models";
 import { getThinkingLevels } from "open-sse/providers/thinkingLevels.js";
 import { useCopyToClipboard } from "@/shared/hooks/useCopyToClipboard";
 import { useModelCaps } from "@/shared/hooks/useModelCaps";
+import { useNotificationStore } from "@/store/notificationStore";
 import { translate } from "@/i18n/runtime";
 import { fetchSuggestedModels } from "@/shared/utils/providerModelsFetcher";
 import { getProviderCustomModelRows } from "@/shared/utils/providerCustomModels";
@@ -80,6 +81,7 @@ export default function ProviderDetailPage() {
   const stopOneByOneRef = useRef(false);
   const [importingQoderModels, setImportingQoderModels] = useState(false);
   const { copied, copy } = useCopyToClipboard();
+  const notify = useNotificationStore();
 
   const AG_RISK_STORAGE_KEY = "ag_risk_confirmed";
 
@@ -504,22 +506,35 @@ export default function ProviderDetailPage() {
   };
 
   const handleAddCustomModel = async (modelId, type = "llm", providerAliasOverride = providerStorageAlias) => {
+    const fullModel = `${providerAliasOverride}/${modelId}`;
     try {
       const res = await fetch("/api/models/custom", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body: JSON.stringify({ providerAlias: providerAliasOverride, id: modelId, type }),
       });
+      const data = await res.json().catch(() => ({}));
       if (res.ok) {
-        await fetchCustomModels();
+        // A built-in model that was permanently deleted is hidden by its
+        // tombstone. Refresh both sources so restoring it is visible at once.
+        await Promise.all([fetchCustomModels(), fetchDeletedModels()]);
         if (typeof window !== "undefined") window.dispatchEvent(new CustomEvent("customModelChanged"));
+        if (data.restored) {
+          notify.success(`${fullModel} has been restored.`);
+        } else if (data.added) {
+          notify.success(`${fullModel} has been added.`);
+        } else {
+          notify.info(`${fullModel} is already available.`);
+        }
+        return data;
       } else {
-        const data = await res.json();
+        notify.error(data.error || `Failed to add ${fullModel}.`);
-        alert(data.error || "Failed to add custom model");
       }
     } catch (error) {
       console.log("Error adding custom model:", error);
+      notify.error(`Failed to add ${fullModel}. Check the connection and try again.`);
     }
+    return null;
   };
 
   const handleDeleteCustomModel = async (modelId, type = "llm", providerAliasOverride = providerStorageAlias) => {
@@ -1706,8 +1721,9 @@ export default function ProviderDetailPage() {
           providerAlias={providerStorageAlias}
           providerDisplayAlias={providerDisplayAlias}
           onSave={async (modelId) => {
-            await handleAddCustomModel(modelId, "llm", providerStorageAlias);
+            const result = await handleAddCustomModel(modelId, "llm", providerStorageAlias);
-            setShowAddCustomModel(false);
+            if (result) setShowAddCustomModel(false);
+            return result;
           }}
           onClose={() => setShowAddCustomModel(false)}
         />