feat: scale instances, --reuse-values, values diff, UI redesign, hover animations

Backend (Phase 1):
- Add ScaleInstance endpoint (POST /clusters/{id}/instances/{id}/scale)
- Add GetInstanceValuesDiff endpoint (GET .../values-diff)
- Enable ReuseValues=true in Helm Upgrade for --reuse-values behavior
- Add GetValues/GetChartDefaultValues to HelmClient interface
- Add ScaleInstanceRequest/Response and InstanceValuesDiffResponse DTOs

Frontend (Phase 2):
- InstanceCard: +/- scale buttons with loading spinner
- ModifyModal: values diff view (current vs defaults), Use Defaults button
- ArtifactBrowserPage: collapsible sidebar, compact tag grid, search filter
- TagCard: "LATEST" badge, compact layout, responsive design
- InstanceCard: compact 3-column layout, fewer scrolls needed
- InstancesManagementPage: 3-column grid, compact view
- Global hover-lift and hover-glow CSS utilities
- SidebarNav: subtle hover transition on links

backend/cmd/api/main.go

@@ -285,6 +285,8 @@ func setupRouter(
 	protected.HandleFunc("/clusters/{cluster_id}/instances/{instance_id}/entries", instanceHandler.ListInstanceEntries).Methods(http.MethodGet)
 	protected.HandleFunc("/clusters/{cluster_id}/instances/{instance_id}/diagnostics", instanceHandler.GetInstanceDiagnostics).Methods(http.MethodGet)
 	protected.HandleFunc("/clusters/{cluster_id}/instances/{instance_id}/logs/stream", instanceHandler.StreamInstanceLogs).Methods(http.MethodGet)
+	protected.HandleFunc("/clusters/{cluster_id}/instances/{instance_id}/scale", instanceHandler.ScaleInstance).Methods(http.MethodPost)
+	protected.HandleFunc("/clusters/{cluster_id}/instances/{instance_id}/values-diff", instanceHandler.GetInstanceValuesDiff).Methods(http.MethodGet)
 
 	// ===== Monitoring 路由 =====
 	protected.HandleFunc("/monitoring/clusters", monitoringHandler.ListClusterMonitoring).Methods(http.MethodGet)

backend/internal/adapter/input/http/dto/instance_dto.go

@@ -206,6 +206,25 @@ type InstanceEventDiagnostics struct {
 	LastTimestamp  string `json:"lastTimestamp,omitempty"`
 }
 
+// ScaleInstanceRequest 扩缩容实例请求
+type ScaleInstanceRequest struct {
+	Replicas int    `json:"replicas" binding:"required"`
+	Workload string `json:"workload"`
+}
+
+// ScaleInstanceResponse 扩缩容实例响应
+type ScaleInstanceResponse struct {
+	Instance *InstanceResponse `json:"instance"`
+	Replicas int               `json:"replicas"`
+	Message  string            `json:"message"`
+}
+
+// InstanceValuesDiffResponse 实例 values 差异响应
+type InstanceValuesDiffResponse struct {
+	Current  map[string]interface{} `json:"current"`
+	Defaults map[string]interface{} `json:"defaults"`
+}
+
 type InstancePodLogResponse struct {
 	Pod       string `json:"pod"`
 	Container string `json:"container"`

backend/internal/adapter/input/http/rest/instance_handler.go

@@ -371,6 +371,49 @@ func (h *InstanceHandler) StreamInstanceLogs(w http.ResponseWriter, r *http.Requ
 	}
 }
 
+// ScaleInstance 扩缩容实例
+func (h *InstanceHandler) ScaleInstance(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	clusterID := vars["cluster_id"]
+	instanceID := vars["instance_id"]
+
+	var req dto.ScaleInstanceRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		respondError(w, http.StatusBadRequest, "Invalid request body", err.Error())
+		return
+	}
+	if req.Replicas < 0 {
+		respondError(w, http.StatusBadRequest, "Invalid replicas", "replicas must be >= 0")
+		return
+	}
+
+	result, err := h.instanceService.ScaleInstance(r.Context(), clusterID, instanceID, req.Replicas, req.Workload)
+	if err != nil {
+		respondServiceError(w, err, "Failed to scale instance")
+		return
+	}
+
+	respondJSON(w, http.StatusOK, dto.ScaleInstanceResponse{
+		Instance: convertInstanceResponse(result, true),
+		Replicas: req.Replicas,
+		Message:  fmt.Sprintf("Scaled to %d replicas", req.Replicas),
+	})
+}
+
+// GetInstanceValuesDiff 获取实例 values 差异
+func (h *InstanceHandler) GetInstanceValuesDiff(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	clusterID := vars["cluster_id"]
+	instanceID := vars["instance_id"]
+
+	diff, err := h.instanceService.GetInstanceValuesDiff(r.Context(), clusterID, instanceID)
+	if err != nil {
+		respondServiceError(w, err, "Failed to get values diff")
+		return
+	}
+	respondJSON(w, http.StatusOK, diff)
+}
+
 func convertInstanceEntry(entry *entity.InstanceEntry) *dto.InstanceEntryResponse {
 	portResponses := make([]dto.InstanceEntryPortResponse, 0, len(entry.Ports))
 	for _, port := range entry.Ports {

backend/internal/adapter/output/helm/mock/helm_client_mock.go

@@ -194,3 +194,13 @@ func (c *HelmClientMock) GetValues(ctx context.Context, cluster *entity.Cluster,
 	return instance.Values, nil
 }
 
+func (c *HelmClientMock) GetChartDefaultValues(chartPath string) (map[string]interface{}, error) {
+	return map[string]interface{}{
+		"replicaCount": 1,
+		"image": map[string]interface{}{
+			"repository": "nginx",
+			"tag":        "latest",
+		},
+	}, nil
+}
+

backend/internal/adapter/output/helm/real/helm_client.go

@@ -159,6 +159,7 @@ func (h *HelmClient) Upgrade(ctx context.Context, cluster *entity.Cluster, insta
 
 	upgrade := action.NewUpgrade(actionConfig)
 	upgrade.Namespace = instance.Namespace
+	upgrade.ReuseValues = true
 	upgrade.Wait = true
 	upgrade.Timeout = helmOperationTimeout()
 
@@ -321,6 +322,7 @@ func (h *HelmClient) GetValues(ctx context.Context, cluster *entity.Cluster, rel
 	defer cleanup()
 
 	getValues := action.NewGetValues(actionConfig)
+	getValues.AllValues = true
 	values, err := getValues.Run(releaseName)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get values: %w", err)
@@ -329,6 +331,21 @@ func (h *HelmClient) GetValues(ctx context.Context, cluster *entity.Cluster, rel
 	return values, nil
 }
 
+// GetChartDefaultValues 从 chart 包中读取默认 values
+func (h *HelmClient) GetChartDefaultValues(chartPath string) (map[string]interface{}, error) {
+	chart, err := loader.Load(chartPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load chart: %w", err)
+	}
+	vals := make(map[string]interface{})
+	if chart.Values != nil {
+		for k, v := range chart.Values {
+			vals[k] = v
+		}
+	}
+	return vals, nil
+}
+
 // convertReleaseToInstance 转换 Helm Release 为 Instance
 func (h *HelmClient) convertReleaseToInstance(rel *release.Release) *entity.Instance {
 	return &entity.Instance{

backend/internal/domain/repository/helm_client.go

@@ -30,4 +30,7 @@ type HelmClient interface {
 
 	// GetValues 获取 Release 的 values
 	GetValues(ctx context.Context, cluster *entity.Cluster, releaseName, namespace string) (map[string]interface{}, error)
+
+	// GetChartDefaultValues 从 chart 包中读取默认 values
+	GetChartDefaultValues(chartPath string) (map[string]interface{}, error)
 }

backend/internal/domain/service/instance_service.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/ocdp/cluster-service/internal/adapter/input/http/dto"
 	"github.com/ocdp/cluster-service/internal/domain/entity"
 	"github.com/ocdp/cluster-service/internal/domain/repository"
 	"github.com/ocdp/cluster-service/internal/pkg/authz"
@@ -417,6 +418,80 @@ func (s *InstanceService) StreamInstanceLogs(ctx context.Context, clusterID, ins
 	return streamer.StreamPodLogs(ctx, cluster, instance.Namespace, podName, containerName, tailLines)
 }
 
+// ScaleInstance 扩缩容实例（修改 replicaCount 后执行 Helm upgrade）
+func (s *InstanceService) ScaleInstance(ctx context.Context, clusterID, instanceID string, replicas int, workload string) (*entity.Instance, error) {
+	principal, err := authz.RequirePrincipal(ctx)
+	if err != nil {
+		return nil, entity.ErrUnauthorized
+	}
+	instance, err := s.instanceRepo.GetByID(ctx, instanceID)
+	if err != nil {
+		return nil, entity.ErrInstanceNotFound
+	}
+	if !s.canWriteInstance(principal, instance) {
+		return nil, entity.ErrForbidden
+	}
+	cluster, err := s.clusterRepo.GetByID(ctx, clusterID)
+	if err != nil {
+		return nil, entity.ErrClusterNotFound
+	}
+
+	// Get existing Helm values and patch replicaCount
+	vals, err := s.helmClient.GetValues(ctx, cluster, instance.Name, instance.Namespace)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get current values: %w", err)
+	}
+	if vals == nil {
+		vals = make(map[string]interface{})
+	}
+	vals["replicaCount"] = replicas
+
+	instance.SetValues(vals)
+	instance.BeginOperation(entity.OperationUpgrade, fmt.Sprintf("Scaling to %d replicas", replicas))
+	if err := s.instanceRepo.Update(ctx, instance); err != nil {
+		return nil, err
+	}
+
+	go s.executeAndSyncUpgrade(context.Background(), instance.ID, cluster, nil, instance)
+	return instance, nil
+}
+
+// GetInstanceValuesDiff 获取实例当前 values 与 chart 默认 values 的差异
+func (s *InstanceService) GetInstanceValuesDiff(ctx context.Context, clusterID, instanceID string) (*dto.InstanceValuesDiffResponse, error) {
+	principal, err := authz.RequirePrincipal(ctx)
+	if err != nil {
+		return nil, entity.ErrUnauthorized
+	}
+	instance, err := s.instanceRepo.GetByID(ctx, instanceID)
+	if err != nil {
+		return nil, entity.ErrInstanceNotFound
+	}
+	if !s.canReadInstance(principal, instance) {
+		return nil, entity.ErrInstanceNotFound
+	}
+	cluster, err := s.clusterRepo.GetByID(ctx, clusterID)
+	if err != nil {
+		return nil, entity.ErrClusterNotFound
+	}
+
+	current, err := s.helmClient.GetValues(ctx, cluster, instance.Name, instance.Namespace)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get default values from the chart archive
+	chartPath := s.chartArchivePath(instance)
+	defaults, err := s.helmClient.GetChartDefaultValues(chartPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read chart defaults: %w", err)
+	}
+
+	return &dto.InstanceValuesDiffResponse{
+		Current:  current,
+		Defaults: defaults,
+	}, nil
+}
+
 func (s *InstanceService) canReadInstance(principal *authz.Principal, instance *entity.Instance) bool {
 	if principal.IsAdmin() {
 		return true

backend/internal/domain/service/instance_service_test.go

@@ -167,5 +167,9 @@ func (*stubHelmClient) GetValues(ctx context.Context, cluster *entity.Cluster, r
 	return nil, nil
 }
 
+func (*stubHelmClient) GetChartDefaultValues(chartPath string) (map[string]interface{}, error) {
+	return nil, nil
+}
+
 var _ repository.ClusterRepository = (*stubClusterRepo)(nil)
 var _ repository.HelmClient = (*stubHelmClient)(nil)

frontend/src/api/index.ts

@@ -237,6 +237,26 @@ export const getInstance = getClustersClusterIdInstancesInstanceId;
 export const updateInstance = putClustersClusterIdInstancesInstanceId;
 export const deleteInstance = deleteClustersClusterIdInstancesInstanceId;
 export const listInstanceEntries = getClustersClusterIdInstancesInstanceIdEntries;
+export const scaleInstance = (
+  clusterId: string,
+  instanceId: string,
+  body: { replicas: number; workload?: string },
+) => {
+  return customAxiosInstance<{ instance: any; replicas: number; message: string }>({
+    url: `/clusters/${encodeURIComponent(clusterId)}/instances/${encodeURIComponent(instanceId)}/scale`,
+    method: "POST",
+    data: body,
+  });
+};
+export const getInstanceValuesDiff = (
+  clusterId: string,
+  instanceId: string,
+) => {
+  return customAxiosInstance<{ current: Record<string, any>; defaults: Record<string, any> }>({
+    url: `/clusters/${encodeURIComponent(clusterId)}/instances/${encodeURIComponent(instanceId)}/values-diff`,
+    method: "GET",
+  });
+};
 export const getInstanceDiagnostics = (
   params: { clusterId: string; instanceId: string },
   options?: { tailLines?: number },

frontend/src/features/artifact/instances/components/InstanceCard.tsx

@@ -19,9 +19,12 @@ import {
   AlertTriangle,
   History,
   HelpCircle,
+  Minus,
+  Plus,
+  Loader2,
 } from "lucide-react";
 import type { InstanceResponse, InstanceStatus } from "@/api";
-import { INSTANCE_LAST_OPERATION, INSTANCE_STATUS } from "@/api";
+import { INSTANCE_LAST_OPERATION, INSTANCE_STATUS, scaleInstance } from "@/api";
 
 interface InstanceCardProps {
   instance: InstanceResponse;
@@ -29,6 +32,7 @@ interface InstanceCardProps {
   onTerminate: (instance: InstanceResponse) => void;
   onViewEntries: (instance: InstanceResponse) => void;
   onViewDiagnostics: (instance: InstanceResponse) => void;
+  onScale?: (instance: InstanceResponse) => void;
 }
 
 type StatusVisual = {
@@ -136,7 +140,9 @@ export const InstanceCard: React.FC<InstanceCardProps> = ({
   onTerminate,
   onViewEntries,
   onViewDiagnostics,
+  onScale,
 }) => {
+  const [scaling, setScaling] = React.useState(false);
   const normalizedStatus = (instance.status ?? INSTANCE_STATUS.unknown) as InstanceStatus;
   const statusInfo =
     STATUS_INFO_MAP[normalizedStatus] ?? STATUS_INFO_MAP[INSTANCE_STATUS.unknown];
@@ -163,120 +169,161 @@ export const InstanceCard: React.FC<InstanceCardProps> = ({
   const lastError =
     typeof instance.lastError === "string" ? instance.lastError.trim() : "";
 
-  return (
-    <div className="group relative bg-gradient-to-br from-white via-white to-slate-50 border border-slate-200 rounded-xl hover:border-blue-500/50 hover:shadow-xl hover:shadow-blue-500/10 transition-all duration-300 overflow-hidden">
-      {/* Decorative gradient overlay */}
-      <div className="absolute top-0 right-0 w-64 h-64 bg-gradient-to-br from-blue-500/5 to-purple-500/5 rounded-full blur-3xl -z-0 opacity-0 group-hover:opacity-100 transition-opacity duration-500"></div>
+  // Extract replica count from values
+  const parsedValues = React.useMemo(() => {
+    if (!instance.values) return null;
+    try {
+      return typeof instance.values === "string"
+        ? JSON.parse(instance.values)
+        : (instance.values as Record<string, any>);
+    } catch {
+      return null;
+    }
+  }, [instance.values]);
+  const currentReplicas = parsedValues?.replicaCount ?? parsedValues?.replicas ?? 1;
 
-      {/* Header with enhanced design */}
-      <div className="relative px-6 py-5 border-b border-slate-200 bg-gradient-to-r from-slate-50 to-white">
-        <div className="flex items-start justify-between">
-          <div className="flex items-start gap-4 flex-1">
-            {/* Enhanced icon with glow effect */}
-            <div className="relative p-3 bg-gradient-to-br from-blue-500/20 to-cyan-500/20 rounded-xl border border-blue-500/30 shadow-lg shadow-blue-500/20 group-hover:shadow-blue-500/40 transition-shadow duration-300">
-              <Box className="w-7 h-7 text-blue-400" />
-              <div className="absolute inset-0 bg-blue-400/10 rounded-xl blur-sm"></div>
+  const handleScale = async (delta: number) => {
+    const newReplicas = Math.max(0, currentReplicas + delta);
+    if (newReplicas === currentReplicas) return;
+    if (!instance.clusterId || !instance.id) return;
+
+    setScaling(true);
+    try {
+      const result = await scaleInstance(instance.clusterId, instance.id, { replicas: newReplicas });
+      onScale?.(result.instance ?? instance);
+    } catch (err) {
+      console.error("[InstanceCard] Scale failed:", err);
+    } finally {
+      setScaling(false);
+    }
+  };
+
+  return (
+    <div className="hover-lift group relative bg-white border border-slate-200 rounded-xl hover:border-blue-500/50 duration-200 overflow-hidden">
+
+      {/* Header - compact */}
+      <div className="relative px-4 py-3 border-b border-slate-200 bg-gradient-to-r from-slate-50 to-white">
+        <div className="flex items-start justify-between gap-3">
+          <div className="flex items-start gap-3 flex-1 min-w-0">
+            {/* Icon */}
+            <div className="flex-shrink-0 p-2 bg-gradient-to-br from-blue-500/20 to-cyan-500/20 rounded-lg border border-blue-500/30">
+              <Box className="w-5 h-5 text-blue-400" />
             </div>
 
             <div className="flex-1 min-w-0">
-              <h3 className="text-xl font-bold text-slate-950 truncate">
+              <h3 className="text-base font-bold text-slate-950 truncate">
                 {instanceName}
               </h3>
-              <div className="flex items-center gap-2 mt-2">
-                <Package className="w-4 h-4 text-slate-500" />
-                <p className="text-sm text-slate-500 font-mono">
-                  {repository}
-                </p>
-                <span className="text-slate-600">•</span>
-                <span className="px-2 py-0.5 text-xs font-semibold text-cyan-400 bg-cyan-500/10 border border-cyan-500/30 rounded">
+              <div className="flex items-center gap-1.5 mt-1">
+                <Package className="w-3.5 h-3.5 text-slate-400 flex-shrink-0" />
+                <span className="text-sm text-slate-500 font-mono truncate">{repository}</span>
+                <span className="text-slate-300 flex-shrink-0">&#183;</span>
+                <span className="px-1.5 py-0.5 text-[11px] font-semibold text-cyan-400 bg-cyan-500/10 border border-cyan-500/30 rounded flex-shrink-0">
                   {version}
                 </span>
               </div>
             </div>
           </div>
 
-          {/* Enhanced Status Badge with glow */}
+          {/* Status Badge - prominent but smaller */}
           <div
-            className={`flex items-center gap-2 px-4 py-2 rounded-full border shadow-lg ${statusInfo.bg} ${statusInfo.glow} backdrop-blur-sm`}
+            className={`flex items-center gap-1.5 px-3 py-1 rounded-full border shadow-sm ${statusInfo.bg} flex-shrink-0`}
           >
-            <StatusIcon className={`w-4 h-4 ${statusInfo.color}`} />
-            <span className={`text-sm font-semibold ${statusInfo.color} uppercase tracking-wide`}>
+            <StatusIcon className={`w-3.5 h-3.5 ${statusInfo.color}`} />
+            <span className={`text-xs font-semibold ${statusInfo.color} uppercase tracking-wide`}>
               {statusLabel}
             </span>
           </div>
         </div>
 
-        <div className="mt-4 flex flex-col gap-1 text-sm text-slate-700">
-          <span className="font-medium text-slate-700">{statusReason}</span>
+        {/* Status reason + last operation - compact inline */}
+        <div className="mt-2 flex items-center gap-2 text-xs text-slate-600">
+          <span className="truncate">{statusReason}</span>
           {lastOperationLabel && (
-            <span className="text-xs uppercase tracking-wide text-slate-500">
-              Operation: {lastOperationLabel}
-            </span>
+            <>
+              <span className="text-slate-300 flex-shrink-0">|</span>
+              <span className="uppercase tracking-wide text-slate-400 whitespace-nowrap flex-shrink-0">
+                {lastOperationLabel}
+              </span>
+            </>
           )}
         </div>
       </div>
 
-      {/* Enhanced Content Grid */}
-      <div className="relative px-6 py-5 space-y-4 bg-gradient-to-b from-white to-slate-50">
-        <div className="grid grid-cols-2 gap-4">
-          {/* Namespace */}
-          <div className="p-3 bg-white border border-slate-200 rounded-lg hover:border-purple-500/30 transition-colors">
-            <div className="flex items-center gap-2 mb-2">
-              <Layers className="w-4 h-4 text-purple-400" />
-              <p className="text-xs text-slate-500 uppercase font-semibold tracking-wider">Namespace</p>
+      {/* Content - compact 3-column layout */}
+      <div className="px-4 py-3 space-y-2">
+        {/* Row 1: Namespace | Revision | Launched */}
+        <div className="grid grid-cols-3 gap-3">
+          <div>
+            <div className="flex items-center gap-1 mb-0.5">
+              <Layers className="w-3 h-3 text-purple-400 flex-shrink-0" />
+              <p className="text-[11px] text-slate-500 uppercase font-semibold tracking-wider">Namespace</p>
             </div>
-            <p className="text-sm font-bold text-slate-900">
-              {namespace}
-            </p>
+            <p className="text-sm font-medium text-slate-900">{namespace}</p>
           </div>
-          
-          {/* Revision */}
-          <div className="p-3 bg-white border border-slate-200 rounded-lg hover:border-green-500/30 transition-colors">
-            <div className="flex items-center gap-2 mb-2">
-              <GitBranch className="w-4 h-4 text-green-400" />
-              <p className="text-xs text-slate-500 uppercase font-semibold tracking-wider">Revision</p>
+          <div>
+            <div className="flex items-center gap-1 mb-0.5">
+              <GitBranch className="w-3 h-3 text-green-400 flex-shrink-0" />
+              <p className="text-[11px] text-slate-500 uppercase font-semibold tracking-wider">Revision</p>
             </div>
-            <p className="text-sm font-bold text-slate-900">
-              {revision}
-            </p>
+            <p className="text-sm font-medium text-slate-900">{revision}</p>
           </div>
-          
-          {/* Repository - Full Width */}
-          <div className="col-span-2 p-3 bg-white border border-slate-200 rounded-lg hover:border-blue-500/30 transition-colors">
-            <div className="flex items-center gap-2 mb-2">
-              <Package className="w-4 h-4 text-blue-400" />
-              <p className="text-xs text-slate-500 uppercase font-semibold tracking-wider">Repository</p>
+          <div>
+            <div className="flex items-center gap-1 mb-0.5">
+              <Calendar className="w-3 h-3 text-amber-400 flex-shrink-0" />
+              <p className="text-[11px] text-slate-500 uppercase font-semibold tracking-wider">Launched</p>
             </div>
-            <p className="text-sm font-mono text-slate-900 truncate" title={repository}>
-              {repository}
-            </p>
-          </div>
-          
-          {/* Launched Date - Full Width */}
-          <div className="col-span-2 p-3 bg-white border border-slate-200 rounded-lg hover:border-amber-500/30 transition-colors">
-            <div className="flex items-center gap-2 mb-2">
-              <Calendar className="w-4 h-4 text-amber-400" />
-              <p className="text-xs text-slate-500 uppercase font-semibold tracking-wider">Launched</p>
-            </div>
-            <p className="text-sm font-bold text-slate-900">
-              {createdAtText}
-            </p>
+            <p className="text-sm font-medium text-slate-900">{createdAtText}</p>
           </div>
         </div>
 
         {lastError && (
-          <div className="flex items-start gap-3 p-4 border border-rose-500/30 bg-rose-500/10 rounded-lg">
-            <div className="p-2 bg-rose-500/20 rounded-lg border border-rose-500/40">
-              <AlertTriangle className="w-5 h-5 text-rose-700" />
-            </div>
-            <div>
-              <p className="text-sm font-semibold text-rose-200">Last error</p>
-              <p className="text-sm text-rose-100/90">{lastError}</p>
+          <div className="flex items-start gap-2 p-2.5 border border-rose-500/30 bg-rose-500/10 rounded-lg">
+            <AlertTriangle className="w-4 h-4 text-rose-500 flex-shrink-0 mt-0.5" />
+            <div className="min-w-0">
+              <p className="text-xs font-semibold text-rose-700">Last error</p>
+              <p className="text-xs text-rose-600 truncate">{lastError}</p>
             </div>
           </div>
         )}
       </div>
 
+      {/* Scale Controls */}
+      {instance.status === "deployed" && (
+        <div className="flex items-center justify-between gap-2 px-6 py-3 bg-slate-50/50 border-t border-gray-100 dark:border-gray-700">
+          <span className="text-xs text-gray-500 dark:text-gray-400 font-medium">Replicas:</span>
+          <div className="flex items-center gap-1">
+            <button
+              onClick={() => handleScale(-1)}
+              disabled={scaling || currentReplicas <= 0}
+              className="inline-flex items-center justify-center w-8 h-8 rounded-lg border border-slate-200 bg-white text-slate-600 hover:border-blue-400 hover:text-blue-600 hover:bg-blue-50 disabled:opacity-40 disabled:cursor-not-allowed transition-all duration-150"
+              title="Scale down"
+            >
+              {scaling ? (
+                <Loader2 className="w-4 h-4 animate-spin" />
+              ) : (
+                <Minus className="w-4 h-4" />
+              )}
+            </button>
+            <span className="inline-flex items-center justify-center min-w-[2.5rem] px-2 py-1 text-sm font-bold text-slate-900 bg-white border border-slate-200 rounded-lg">
+              {currentReplicas}
+            </span>
+            <button
+              onClick={() => handleScale(1)}
+              disabled={scaling}
+              className="inline-flex items-center justify-center w-8 h-8 rounded-lg border border-slate-200 bg-white text-slate-600 hover:border-blue-400 hover:text-blue-600 hover:bg-blue-50 disabled:opacity-40 disabled:cursor-not-allowed transition-all duration-150"
+              title="Scale up"
+            >
+              {scaling ? (
+                <Loader2 className="w-4 h-4 animate-spin" />
+              ) : (
+                <Plus className="w-4 h-4" />
+              )}
+            </button>
+          </div>
+        </div>
+      )}
+
       {/* Enhanced Actions Bar */}
       <div className="relative px-6 py-4 bg-gradient-to-r from-slate-50 via-slate-50 to-white border-t border-slate-200 backdrop-blur-sm">
         <div className="grid grid-cols-2 gap-2 md:grid-cols-2 xl:grid-cols-4">

frontend/src/features/artifact/instances/components/ModifyModal.tsx

@@ -7,7 +7,7 @@ import React, { useState, useEffect } from "react";
 import { Settings } from "lucide-react";
 import { parse as parseYaml, stringify as stringifyYaml } from "yaml";
 import type { InstanceResponse, UpdateInstanceRequest } from "@/api";
-import { getValuesSchema } from "@/api";
+import { getValuesSchema, getInstanceValuesDiff } from "@/api";
 import { 
   Modal, 
   Button, 
@@ -44,6 +44,15 @@ export const ModifyModal: React.FC<ModifyModalProps> = ({
   const [inputMethod, setInputMethod] = useState<'form' | 'yaml'>('yaml');
   const [formValues, setFormValues] = useState<Record<string, any>>({});
 
+  // Values Diff support
+  const [showDiff, setShowDiff] = useState(false);
+  const [loadingDiff, setLoadingDiff] = useState(false);
+  const [diffData, setDiffData] = useState<{
+    current: Record<string, any>;
+    defaults: Record<string, any>;
+  } | null>(null);
+  const [diffError, setDiffError] = useState<string | null>(null);
+
   // Initialize with current values
   useEffect(() => {
     setTag(instance.version || "");
@@ -65,6 +74,9 @@ export const ModifyModal: React.FC<ModifyModalProps> = ({
 
     // Load values schema
     loadValuesSchema();
+
+    // Load values diff
+    loadValuesDiff();
   }, [instance]);
 
   const loadValuesSchema = async () => {
@@ -100,6 +112,61 @@ export const ModifyModal: React.FC<ModifyModalProps> = ({
     }
   };
 
+  const loadValuesDiff = async () => {
+    if (!instance.clusterId || !instance.id) return;
+
+    setLoadingDiff(true);
+    setDiffError(null);
+    setDiffData(null);
+    try {
+      const data = await getInstanceValuesDiff(instance.clusterId, instance.id);
+      if (data && data.current && data.defaults) {
+        setDiffData({ current: data.current, defaults: data.defaults });
+      }
+    } catch (err) {
+      console.error("[ModifyModal] Failed to load values diff:", err);
+      setDiffError("Failed to load values diff");
+    } finally {
+      setLoadingDiff(false);
+    }
+  };
+
+  const applyDefaults = () => {
+    if (!diffData?.defaults) return;
+    const defaultYaml = stringifyYaml(diffData.defaults);
+    setValuesYaml(defaultYaml);
+    setFormValues(diffData.defaults);
+  };
+
+  /**
+   * Render a values object as YAML lines, bolding keys that differ from defaults.
+   */
+  const renderDiffValues = (
+    values: Record<string, any>,
+    compare: Record<string, any>,
+  ): React.ReactNode => {
+    const yaml = stringifyYaml(values);
+    const lines = yaml.split("\n");
+    return lines.map((line, i) => {
+      // Extract the key name from a YAML line
+      const keyMatch = line.match(/^(\s*)([a-zA-Z_][\w-]*)\s*:/);
+      if (keyMatch) {
+        const key = keyMatch[2];
+        const keyChanged =
+          compare[key] !== undefined &&
+          JSON.stringify(values[key]) !== JSON.stringify(compare[key]);
+        if (keyChanged) {
+          return (
+            <span key={i} className="block">
+              {keyMatch[1]}<strong className="text-amber-600 dark:text-amber-400">{key}</strong>:{line.slice(keyMatch[0].length)}
+            </span>
+          );
+        }
+      }
+      return <span key={i} className="block">{line}</span>;
+    });
+  };
+
   const handleFormValuesChange = (values: Record<string, any>) => {
     setFormValues(values);
     setValuesYaml(stringifyYaml(values));
@@ -266,6 +333,80 @@ export const ModifyModal: React.FC<ModifyModalProps> = ({
           )}
         </div>
 
+        {/* Values Diff Section */}
+        {instance.clusterId && instance.id && (
+          <div className="border-t border-slate-200 pt-3">
+            <button
+              type="button"
+              onClick={() => {
+                if (!showDiff && !diffData) {
+                  loadValuesDiff();
+                }
+                setShowDiff(!showDiff);
+              }}
+              className="flex items-center gap-2 text-sm font-medium text-indigo-600 hover:text-indigo-700 transition-colors"
+            >
+              <span>{showDiff ? "Hide" : "Show"} Values Diff</span>
+              <span className={`text-xs transition-transform ${showDiff ? "rotate-180" : ""}`}>▼</span>
+            </button>
+
+            {showDiff && (
+              <div className="mt-3 space-y-3">
+                {loadingDiff && (
+                  <LoadingState message="Loading values diff..." />
+                )}
+                {diffError && (
+                  <ErrorState title="Diff Error" message={diffError} />
+                )}
+                {diffData && (
+                  <>
+                    <div className="grid grid-cols-2 gap-3">
+                      {/* Current Values */}
+                      <div>
+                        <div className="flex items-center gap-2 mb-1">
+                          <span className="text-xs font-semibold uppercase tracking-wider text-slate-500">
+                            Current
+                          </span>
+                          <Badge variant="default" size="sm">deployed</Badge>
+                        </div>
+                        <pre className="text-xs font-mono bg-slate-50 border border-slate-200 rounded-lg p-3 max-h-64 overflow-auto whitespace-pre text-slate-700">
+                          {renderDiffValues(diffData.current, diffData.defaults)}
+                        </pre>
+                      </div>
+                      {/* Default Values */}
+                      <div>
+                        <div className="flex items-center gap-2 mb-1">
+                          <span className="text-xs font-semibold uppercase tracking-wider text-slate-500">
+                            Defaults
+                          </span>
+                          <Badge variant="info" size="sm">chart</Badge>
+                        </div>
+                        <pre className="text-xs font-mono bg-slate-50 border border-slate-200 rounded-lg p-3 max-h-64 overflow-auto whitespace-pre text-slate-500">
+                          {renderDiffValues(diffData.defaults, diffData.current)}
+                        </pre>
+                      </div>
+                    </div>
+                    {/* Legend */}
+                    <p className="text-xs text-slate-500">
+                      <strong className="text-amber-600 dark:text-amber-400">Bold amber keys</strong> differ between current and default values.
+                    </p>
+                    {/* Use Defaults Button */}
+                    <button
+                      type="button"
+                      onClick={applyDefaults}
+                      className="inline-flex items-center gap-1.5 text-xs font-medium text-indigo-600 hover:text-indigo-700 bg-indigo-50 hover:bg-indigo-100 border border-indigo-200 rounded-lg px-3 py-1.5 transition-all"
+                      title="Replace current values with chart defaults"
+                    >
+                      <Settings className="w-3.5 h-3.5" />
+                      Use Defaults
+                    </button>
+                  </>
+                )}
+              </div>
+            )}
+          </div>
+        )}
+
         <p className="text-xs text-slate-500">
           Update applies the selected chart version and values override. Resource readiness is tracked from the instance list after submit.
         </p>

frontend/src/features/artifact/instances/pages/InstancesManagementPage.tsx

@@ -421,7 +421,7 @@ const InstancesManagementPage: React.FC = () => {
                         </p>
                       </div>
                     </div>
-                    <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
+                    <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
                       {instances.map((instance) => (
                         <InstanceCard
                           key={instance.id}
@@ -438,7 +438,7 @@ const InstancesManagementPage: React.FC = () => {
                 );
               })
             ) : (
-              <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
+              <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
                 {filteredInstances.map(({ instance }) => (
                 <InstanceCard
                   key={instance.id}

frontend/src/features/artifact/registries/components/TagCard.tsx

@@ -13,9 +13,10 @@ interface TagCardProps {
   registryId: string;
   registryUrl?: string;
   tag: ArtifactListItem;
+  isLatest?: boolean;
 }
 
-export const TagCard: React.FC<TagCardProps> = ({ registryId, registryUrl, tag }) => {
+export const TagCard: React.FC<TagCardProps> = ({ registryId, registryUrl, tag, isLatest = false }) => {
   const { success } = useToast();
   const [launchModalOpen, setLaunchModalOpen] = useState(false);
   const category = inferArtifactCategory(tag);
@@ -73,67 +74,62 @@ export const TagCard: React.FC<TagCardProps> = ({ registryId, registryUrl, tag }
 
   return (
     <>
-      <div className="bg-white border border-slate-200 rounded-lg p-4 hover:border-brand-blue/50 transition-all group">
-        <div className="flex items-start gap-3">
-          {/* Icon */}
-          <div className="flex-shrink-0">
-            <div className={`w-10 h-10 rounded-lg border ${getTypeColor(category)} 
-              flex items-center justify-center text-lg`}>
-              {getTypeIcon(category)}
-            </div>
+      <div className="hover-lift relative bg-white border border-slate-200 rounded-lg p-3 hover:border-brand-blue/50 transition-all group">
+        {/* LATEST badge */}
+        {isLatest && (
+          <span className="absolute -top-1.5 right-3 px-2 py-0.5 rounded-full text-[10px] font-bold uppercase tracking-wider bg-emerald-500 text-white shadow-sm">
+            LATEST
+          </span>
+        )}
+
+        {/* Top row: tag name + type badge */}
+        <div className="flex items-center gap-2 mb-1.5">
+          <div className={`w-6 h-6 rounded-md border ${getTypeColor(category)} flex items-center justify-center flex-shrink-0`}>
+            <span className="scale-75">{getTypeIcon(category)}</span>
           </div>
+          <h3 className="text-sm font-semibold text-slate-900 truncate flex-1">
+            {tag.tag || 'N/A'}
+          </h3>
+          <span
+            className={`px-1.5 py-0.5 rounded text-[10px] border ${getTypeColor(category)} flex-shrink-0`}
+            title={tag.mediaType || tag.type || ''}
+          >
+            {category}
+          </span>
+        </div>
 
-          {/* Content */}
-          <div className="flex-1 min-w-0">
-            {/* Tag name */}
-            <div className="flex items-center gap-2 mb-1">
-              <Package className="w-4 h-4 text-blue-600 flex-shrink-0" />
-              <h3 className="text-sm font-semibold text-slate-900 truncate">
-                {tag.tag || 'N/A'}
-              </h3>
-              <span
-                className={`px-2 py-0.5 rounded text-xs border ${getTypeColor(category)}`}
-                title={tag.mediaType || tag.type || ''}
-              >
-                {category}
-              </span>
-            </div>
+        {/* Repository path */}
+        <p className="text-[11px] text-slate-400 truncate mb-2" title={tag.repositoryName || ''}>
+          {tag.repositoryName || ' '}
+        </p>
 
-            {/* Repository path */}
-            <p className="text-xs text-slate-500 truncate mb-2">
-              {tag.repositoryName}
-            </p>
-
-            {/* Size */}
-            <div className="flex items-center gap-2 text-xs text-slate-500">
-              <HardDrive className="w-3.5 h-3.5" />
-              <span>{formatSize(tag.size || 0)}</span>
-            </div>
+        {/* Bottom row: size + actions */}
+        <div className="flex items-center justify-between gap-2">
+          <div className="flex items-center gap-1.5 text-[11px] text-slate-400 flex-shrink-0">
+            <HardDrive className="w-3 h-3" />
+            <span>{formatSize(tag.size || 0)}</span>
           </div>
-
-          {/* Actions */}
-          <div className="flex-shrink-0 flex flex-col gap-2">
+          <div className="flex items-center gap-1.5 flex-shrink-0">
+            <button
+              onClick={handleCopy}
+              className="px-2 py-1 bg-white hover:bg-slate-50 text-slate-500
+                border border-slate-200 rounded text-[11px] transition-colors flex items-center gap-1"
+              title="Copy pull command"
+            >
+              <Copy className="w-3 h-3" />
+              <span>Copy</span>
+            </button>
             {category === "chart" && (
               <button
                 onClick={handleLaunch}
-                className="px-3 py-1.5 bg-blue-600 hover:bg-blue-700 text-white rounded
-                  text-xs font-medium transition-colors flex items-center gap-1.5"
+                className="px-2 py-1 bg-blue-600 hover:bg-blue-700 text-white rounded
+                  text-[11px] font-medium transition-colors flex items-center gap-1"
                 title="Launch this Helm chart"
               >
-                <Rocket className="w-3.5 h-3.5" />
+                <Rocket className="w-3 h-3" />
                 <span>Launch</span>
               </button>
             )}
-
-            <button
-              onClick={handleCopy}
-              className="px-3 py-1.5 bg-white hover:bg-slate-50 text-slate-700
-                border border-slate-200 rounded text-xs transition-colors flex items-center gap-1.5"
-              title="Copy pull command"
-            >
-              <Copy className="w-3.5 h-3.5" />
-              <span>Copy</span>
-            </button>
           </div>
         </div>
       </div>

frontend/src/features/artifact/registries/pages/ArtifactBrowserPage.tsx

@@ -11,6 +11,8 @@ import {
   Search,
   ChevronRight,
   ChevronDown,
+  ChevronLeft,
+  LayoutGrid,
 } from "lucide-react";
 import { useToast } from "@/shared";
 import {
@@ -67,7 +69,9 @@ const ArtifactBrowserPage: React.FC = () => {
   const [artifactError, setArtifactError] = useState<string | null>(null);
   const [filter, setFilter] = useState<ListArtifactsFilter | undefined>("chart");
 
+  const [sidebarCollapsed, setSidebarCollapsed] = useState(false);
   const [searchTerm, setSearchTerm] = useState("");
+  const [tagSearchTerm, setTagSearchTerm] = useState("");
 
   const loadArtifacts = useCallback(
     async (
@@ -249,6 +253,12 @@ const ArtifactBrowserPage: React.FC = () => {
       );
   }, [registryNodes, searchTerm]);
 
+  const filteredArtifacts = useMemo(() => {
+    const term = tagSearchTerm.trim().toLowerCase();
+    if (!term) return artifacts;
+    return artifacts.filter((a) => (a.tag || "").toLowerCase().includes(term));
+  }, [artifacts, tagSearchTerm]);
+
   const selectedRegistryName = selectedRepository
     ? registryNodes.find((node) => node.registry.id === selectedRepository.registryId)?.registry
         .name
@@ -283,120 +293,170 @@ const ArtifactBrowserPage: React.FC = () => {
         </div>
       </div>
       <div className="flex-1 flex overflow-hidden bg-slate-50">
-        <aside className="w-80 border-r border-slate-200 bg-white flex flex-col">
-          <div className="p-4 border-b border-slate-200 space-y-2">
-            <div className="relative">
-              <Search className="absolute left-2 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
-              <input
-                type="text"
-                placeholder="Search registries / repositories..."
-                value={searchTerm}
-                onChange={(e) => setSearchTerm(e.target.value)}
-                className="w-full pl-8 pr-3 py-2 rounded-lg bg-white border border-slate-200 text-sm text-slate-900 placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-blue-500"
-              />
-            </div>
-            {repositoryError && (
-              <p className="text-xs text-red-400">{repositoryError}</p>
-            )}
-            <div className="flex items-center justify-between text-xs text-slate-500">
-              <span>Registries</span>
-              <Badge variant="secondary">{registryNodes.length}</Badge>
-            </div>
-          </div>
-
-          <div className="flex-1 overflow-y-auto custom-scrollbar">
-            {loadingRegistries ? (
-              <div className="p-4">
-                <LoadingState message="Loading registries..." />
-              </div>
-            ) : filteredNodes.length === 0 ? (
-              <div className="p-4">
-                <EmptyState
-                  icon={Database}
-                  title="No registries"
-                description="Add a Harbor registry to browse deployable charts."
-                />
-              </div>
-            ) : (
-              filteredNodes.map((node) => (
-                <div key={node.registry.id || node.registry.name}>
-                  <button
-                    onClick={() => toggleRegistry(node.registry.id)}
-                    className="w-full flex items-center justify-between px-4 py-3 hover:bg-slate-50 transition"
-                  >
-                    <div className="flex items-center gap-2">
-                      {node.expanded ? (
-                        <ChevronDown className="w-4 h-4 text-slate-500" />
-                      ) : (
-                        <ChevronRight className="w-4 h-4 text-slate-500" />
-                      )}
-                      <Database className="w-4 h-4 text-blue-600" />
-                      <div className="text-left">
-                        <p className="text-sm text-slate-900">{node.registry.name || "Unnamed"}</p>
-                        <p className="text-[11px] text-slate-500 truncate">
-                          {node.registry.url}
-                        </p>
-                      </div>
-                    </div>
-                    <Badge variant="secondary">{node.repositories.length}</Badge>
-                  </button>
-                  {node.expanded && (
-                    <div className="bg-slate-50/60">
-                      {node.repositories.length === 0 ? (
-                        <p className="px-8 py-3 text-xs text-slate-500">
-                          {loadingRepositories
-                            ? "Loading repositories..."
-                            : "No chart repositories found."}
-                        </p>
-                      ) : (
-                        node.repositories.map((repo) => {
-                          const isSelected =
-                            selectedRepository?.registryId === repo.registryId &&
-                            selectedRepository?.name === repo.name;
-                          return (
-                            <button
-                              key={`${repo.registryId}-${repo.name}`}
-                              onClick={() => handleRepositoryClick(repo)}
-                              className={`w-full text-left px-8 py-2 flex items-center justify-between text-sm transition ${
-                                isSelected
-                                  ? "bg-blue-50 text-blue-700"
-                                  : "hover:bg-white/80 text-slate-700"
-                              }`}
-                            >
-                              <span className="truncate">{repo.name}</span>
-                              {repo.artifactCount !== undefined && (
-                                <span className="text-xs text-slate-500">
-                                  {repo.artifactCount}
-                                </span>
-                              )}
-                            </button>
-                          );
-                        })
-                      )}
-                    </div>
-                  )}
+        {/* Collapsible side panel */}
+        <aside
+          className={`border-r border-slate-200 bg-white flex flex-col transition-all duration-200 ${
+            sidebarCollapsed ? "w-12" : "w-80"
+          }`}
+        >
+          {sidebarCollapsed ? (
+            /* Collapsed state: narrow strip with just a toggle */
+            <div className="flex flex-col items-center pt-3 gap-4">
+              <button
+                onClick={() => setSidebarCollapsed(false)}
+                className="p-1.5 hover:bg-slate-100 rounded-md transition"
+                title="Expand sidebar"
+              >
+                <ChevronRight className="w-4 h-4 text-slate-500" />
+              </button>
+              {registryNodes.slice(0, 5).map((node) => (
+                <div
+                  key={node.registry.id || node.registry.name}
+                  className="w-7 h-7 rounded-md bg-blue-50 flex items-center justify-center"
+                  title={node.registry.name || "Registry"}
+                >
+                  <Database className="w-3.5 h-3.5 text-blue-600" />
                 </div>
-              ))
-            )}
-          </div>
+              ))}
+              {registryNodes.length > 5 && (
+                <span className="text-[10px] text-slate-400">
+                  +{registryNodes.length - 5}
+                </span>
+              )}
+            </div>
+          ) : (
+            /* Expanded state: full sidebar */
+            <>
+              <div className="p-4 border-b border-slate-200 space-y-2">
+                <div className="flex items-center gap-2">
+                  <button
+                    onClick={() => setSidebarCollapsed(true)}
+                    className="p-1 hover:bg-slate-100 rounded-md transition flex-shrink-0"
+                    title="Collapse sidebar"
+                  >
+                    <ChevronLeft className="w-4 h-4 text-slate-500" />
+                  </button>
+                  <div className="relative flex-1">
+                    <Search className="absolute left-2 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-500" />
+                    <input
+                      type="text"
+                      placeholder="Search registries / repositories..."
+                      value={searchTerm}
+                      onChange={(e) => setSearchTerm(e.target.value)}
+                      className="w-full pl-8 pr-3 py-2 rounded-lg bg-white border border-slate-200 text-sm text-slate-900 placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-blue-500"
+                    />
+                  </div>
+                </div>
+                {repositoryError && (
+                  <p className="text-xs text-red-400">{repositoryError}</p>
+                )}
+                <div className="flex items-center justify-between text-xs text-slate-500">
+                  <span>Registries</span>
+                  <Badge variant="secondary">{registryNodes.length}</Badge>
+                </div>
+              </div>
+
+              <div className="flex-1 overflow-y-auto custom-scrollbar">
+                {loadingRegistries ? (
+                  <div className="p-4">
+                    <LoadingState message="Loading registries..." />
+                  </div>
+                ) : filteredNodes.length === 0 ? (
+                  <div className="p-4">
+                    <EmptyState
+                      icon={Database}
+                      title="No registries"
+                      description="Add a Harbor registry to browse deployable charts."
+                    />
+                  </div>
+                ) : (
+                  filteredNodes.map((node) => (
+                    <div key={node.registry.id || node.registry.name}>
+                      <button
+                        onClick={() => toggleRegistry(node.registry.id)}
+                        className="w-full flex items-center justify-between px-4 py-3 hover:bg-slate-50 transition"
+                      >
+                        <div className="flex items-center gap-2 min-w-0">
+                          {node.expanded ? (
+                            <ChevronDown className="w-4 h-4 text-slate-500 flex-shrink-0" />
+                          ) : (
+                            <ChevronRight className="w-4 h-4 text-slate-500 flex-shrink-0" />
+                          )}
+                          <Database className="w-4 h-4 text-blue-600 flex-shrink-0" />
+                          <div className="text-left min-w-0">
+                            <p className="text-sm text-slate-900 truncate">
+                              {node.registry.name || "Unnamed"}
+                            </p>
+                            <p className="text-[11px] text-slate-500 truncate">
+                              {node.registry.url}
+                            </p>
+                          </div>
+                        </div>
+                        <Badge variant="secondary" className="flex-shrink-0">
+                          {node.repositories.length}
+                        </Badge>
+                      </button>
+                      {node.expanded && (
+                        <div className="bg-slate-50/60">
+                          {node.repositories.length === 0 ? (
+                            <p className="px-8 py-3 text-xs text-slate-500">
+                              {loadingRepositories
+                                ? "Loading repositories..."
+                                : "No chart repositories found."}
+                            </p>
+                          ) : (
+                            node.repositories.map((repo) => {
+                              const isSelected =
+                                selectedRepository?.registryId === repo.registryId &&
+                                selectedRepository?.name === repo.name;
+                              return (
+                                <button
+                                  key={`${repo.registryId}-${repo.name}`}
+                                  onClick={() => handleRepositoryClick(repo)}
+                                  className={`w-full text-left px-8 py-2 flex items-center justify-between text-sm transition ${
+                                    isSelected
+                                      ? "bg-blue-50 text-blue-700"
+                                      : "hover:bg-white/80 text-slate-700"
+                                  }`}
+                                >
+                                  <span className="truncate">{repo.name}</span>
+                                  {repo.artifactCount !== undefined && (
+                                    <span className="text-xs text-slate-500 flex-shrink-0">
+                                      {repo.artifactCount}
+                                    </span>
+                                  )}
+                                </button>
+                              );
+                            })
+                          )}
+                        </div>
+                      )}
+                    </div>
+                  ))
+                )}
+              </div>
+            </>
+          )}
         </aside>
 
         <main className="flex-1 flex flex-col bg-white overflow-hidden">
           {!selectedRepository ? (
+            /* Placeholder when no repo is selected */
             <div className="flex-1 flex items-center justify-center">
               <EmptyState
-                icon={Package}
-                title="Select a repository"
-                description="Choose a chart repository from the left panel."
+                icon={LayoutGrid}
+                title="Select a chart"
+                description="Select a chart from the left panel to view versions"
               />
             </div>
           ) : (
             <>
+              {/* Right panel header */}
               <div className="flex-shrink-0 border-b border-slate-200 p-5 bg-slate-50">
                 <div className="flex items-center justify-between flex-wrap gap-4">
                   <div>
                     <p className="text-xs uppercase text-slate-500">Chart repository</p>
-                    <h2 className="text-2xl font-semibold text-slate-900">
+                    <h2 className="text-2xl font-semibold text-slate-900 truncate">
                       {selectedRepository.name}
                     </h2>
                     <p className="text-sm text-slate-500">
@@ -422,7 +482,27 @@ const ArtifactBrowserPage: React.FC = () => {
                 </div>
               </div>
 
-              <div className="flex-1 overflow-y-auto p-5">
+              {/* Tag search bar */}
+              <div className="flex-shrink-0 px-5 pt-4 pb-2">
+                <div className="relative max-w-xs">
+                  <Search className="absolute left-2 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-400" />
+                  <input
+                    type="text"
+                    placeholder="Filter tags by version..."
+                    value={tagSearchTerm}
+                    onChange={(e) => setTagSearchTerm(e.target.value)}
+                    className="w-full pl-8 pr-3 py-1.5 rounded-lg bg-white border border-slate-200 text-sm text-slate-900 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500"
+                  />
+                </div>
+                {tagSearchTerm && (
+                  <p className="text-xs text-slate-500 mt-1.5">
+                    Showing {filteredArtifacts.length} of {artifacts.length} tags
+                  </p>
+                )}
+              </div>
+
+              {/* Tag grid */}
+              <div className="flex-1 overflow-y-auto p-5 pt-2">
                 {artifactError && (
                   <p className="text-sm text-red-400 mb-3">{artifactError}</p>
                 )}
@@ -438,14 +518,21 @@ const ArtifactBrowserPage: React.FC = () => {
                         : "This repository doesn't contain any tagged artifacts yet."
                     }
                   />
+                ) : filteredArtifacts.length === 0 ? (
+                  <EmptyState
+                    icon={Search}
+                    title="No matching tags"
+                    description={`No tags matching "${tagSearchTerm}" found.`}
+                  />
                 ) : (
-                  <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
-                    {artifacts.map((artifact, index) => (
+                  <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-3">
+                    {filteredArtifacts.map((artifact, index) => (
                       <TagCard
                         key={`${artifact.repositoryName || "repo"}-${artifact.tag || index}`}
                         registryId={selectedRepository.registryId}
                         registryUrl={selectedRegistryUrl}
                         tag={artifact}
+                        isLatest={index === 0}
                       />
                     ))}
                   </div>

frontend/src/index.css

@@ -28,3 +28,19 @@
   to { opacity: 1; transform: translateY(0); }
 }
 .animate-fadeIn { animation: fadeIn 0.25s ease-out; }
+
+/* Hover animation utilities */
+.hover-lift {
+  transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+.hover-lift:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+.hover-glow {
+  transition: box-shadow 0.2s ease;
+}
+.hover-glow:hover {
+  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
+}

frontend/src/shared/components/layout/SidebarLayout/SidebarNav.tsx

@@ -53,10 +53,10 @@ export default function SidebarNav({ items = [] as NavItem[], isOpen = true, onC
       <div key={item.key}>
         <button
           onClick={() => handleItemClick(item, hasChildren)}
-          className={`w-full text-left flex items-center gap-2 px-3 py-2 rounded-xl text-sm font-medium transition-colors duration-200 ${
+          className={`w-full text-left flex items-center gap-2 px-3 py-2 rounded-xl text-sm font-medium transition-colors duration-150 hover:bg-blue-50 dark:hover:bg-blue-900/20 ${
             item.active
               ? "bg-blue-50 text-blue-700 border border-blue-200 shadow-sm"
-              : "text-slate-600 hover:text-slate-950 hover:bg-slate-100"
+              : "text-slate-600 hover:text-slate-950"
           }`}
           style={{ paddingLeft: `${12 + level * 16}px` }}
         >