feat(26-01): create detail modal flow for template selection

- TemplateDetailModal: full details view with description, workflow preview,
  metadata, and "Use this workflow" button
- TemplateCard: simplified - removed preview icon and tags row,
  card click now opens detail modal
- TemplateExplorerView: wired up new flow where card opens detail modal

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/quickstart/TemplateCard.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import { Node, Edge } from "@xyflow/react";
 import { TemplateCategory } from "@/types/quickstart";
 
 interface TemplateCardProps {
@@ -14,11 +13,9 @@ interface TemplateCardProps {
   };
   nodeCount: number;
   previewImage?: string;
-  workflow?: { nodes: Node[]; edges: Edge[] };
-  isLoading: boolean;
+  isLoading?: boolean;
   onClick: () => void;
-  onPreviewClick?: () => void;
-  disabled: boolean;
+  disabled?: boolean;
 }
 
 const CATEGORY_LABELS: Record<TemplateCategory, string> = {
@@ -39,16 +36,14 @@ export function TemplateCard({
   template,
   nodeCount,
   previewImage,
-  workflow,
-  isLoading,
+  isLoading = false,
   onClick,
-  onPreviewClick,
-  disabled,
+  disabled = false,
 }: TemplateCardProps) {
   return (
     <button
       onClick={onClick}
-      disabled={disabled}
+      disabled={disabled || isLoading}
       className={`
         group w-full text-left rounded-lg border p-4 transition-all
         ${
@@ -112,41 +107,6 @@ export function TemplateCard({
             </svg>
           </div>
         )}
-
-        {/* Workflow Preview Button - show in top right when workflow is available */}
-        {workflow && !isLoading && (
-          <div
-            role="button"
-            tabIndex={0}
-            onClick={(e) => {
-              e.stopPropagation();
-              onPreviewClick?.();
-            }}
-            onKeyDown={(e) => {
-              if (e.key === "Enter" || e.key === " ") {
-                e.stopPropagation();
-                onPreviewClick?.();
-              }
-            }}
-            className="absolute top-2 right-2 p-1.5 rounded-md bg-neutral-900/80 hover:bg-neutral-800 border border-neutral-600 hover:border-neutral-500 transition-colors cursor-pointer"
-            title="Preview workflow"
-          >
-            {/* Node graph icon */}
-            <svg
-              className="w-4 h-4 text-neutral-400 hover:text-neutral-300"
-              fill="none"
-              viewBox="0 0 24 24"
-              stroke="currentColor"
-              strokeWidth={1.5}
-            >
-              <path
-                strokeLinecap="round"
-                strokeLinejoin="round"
-                d="M7.5 14.25v2.25m3-4.5v4.5m3-6.75v6.75m3-9v9M6 20.25h12A2.25 2.25 0 0020.25 18V6A2.25 2.25 0 0018 3.75H6A2.25 2.25 0 003.75 6v12A2.25 2.25 0 006 20.25z"
-              />
-            </svg>
-          </div>
-        )}
       </div>
 
       {/* Name */}
@@ -160,7 +120,7 @@ export function TemplateCard({
       </p>
 
       {/* Metadata row */}
-      <div className="flex items-center gap-2 mb-2">
+      <div className="flex items-center gap-2">
         {/* Node count badge */}
         <span className="inline-flex items-center px-1.5 py-0.5 rounded text-[10px] font-medium bg-neutral-700/50 text-neutral-400">
           {nodeCount} nodes
@@ -176,18 +136,6 @@ export function TemplateCard({
           {CATEGORY_LABELS[template.category]}
         </span>
       </div>
-
-      {/* Tags */}
-      <div className="flex flex-wrap gap-1">
-        {template.tags.slice(0, 4).map((tag) => (
-          <span
-            key={tag}
-            className="px-1.5 py-0.5 rounded text-[10px] bg-neutral-700/30 text-neutral-500"
-          >
-            {tag}
-          </span>
-        ))}
-      </div>
     </button>
   );
 }

src/components/quickstart/TemplateDetailModal.tsx

@@ -0,0 +1,224 @@
+"use client";
+
+import { useEffect, useCallback } from "react";
+import { Node, Edge } from "@xyflow/react";
+import { TemplateCategory } from "@/types/quickstart";
+import { WorkflowPreview } from "./WorkflowPreview";
+
+interface TemplateDetailModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onUseWorkflow: () => void;
+  isLoading: boolean;
+  template: {
+    id: string;
+    name: string;
+    description: string;
+    category: TemplateCategory;
+    tags: string[];
+  };
+  nodeCount: number;
+  workflow: { nodes: Node[]; edges: Edge[] };
+}
+
+const CATEGORY_LABELS: Record<TemplateCategory, string> = {
+  product: "Product",
+  style: "Style",
+  composition: "Composition",
+  community: "Community",
+};
+
+const CATEGORY_COLORS: Record<TemplateCategory, string> = {
+  product: "bg-blue-500/20 text-blue-300 border-blue-500/30",
+  style: "bg-purple-500/20 text-purple-300 border-purple-500/30",
+  composition: "bg-green-500/20 text-green-300 border-green-500/30",
+  community: "bg-amber-500/20 text-amber-300 border-amber-500/30",
+};
+
+export function TemplateDetailModal({
+  isOpen,
+  onClose,
+  onUseWorkflow,
+  isLoading,
+  template,
+  nodeCount,
+  workflow,
+}: TemplateDetailModalProps) {
+  // Handle escape key to close
+  const handleKeyDown = useCallback(
+    (e: KeyboardEvent) => {
+      if (e.key === "Escape" && !isLoading) {
+        onClose();
+      }
+    },
+    [onClose, isLoading]
+  );
+
+  useEffect(() => {
+    if (isOpen) {
+      document.addEventListener("keydown", handleKeyDown);
+      return () => document.removeEventListener("keydown", handleKeyDown);
+    }
+  }, [isOpen, handleKeyDown]);
+
+  if (!isOpen) return null;
+
+  return (
+    <div
+      className="fixed inset-0 z-50 flex items-center justify-center p-4"
+      onClick={isLoading ? undefined : onClose}
+    >
+      {/* Backdrop */}
+      <div className="absolute inset-0 bg-black/70" />
+
+      {/* Modal */}
+      <div
+        className="relative bg-neutral-900 border border-neutral-700 rounded-xl shadow-2xl w-full max-w-4xl max-h-[90vh] flex flex-col overflow-hidden"
+        onClick={(e) => e.stopPropagation()}
+      >
+        {/* Header */}
+        <div className="flex items-start justify-between px-6 py-5 border-b border-neutral-700">
+          <div className="flex-1 pr-4">
+            <div className="flex items-center gap-3 mb-2">
+              <h2 className="text-xl font-semibold text-neutral-100">
+                {template.name}
+              </h2>
+              <span
+                className={`
+                  inline-flex items-center px-2 py-0.5 rounded text-xs font-medium border
+                  ${CATEGORY_COLORS[template.category]}
+                `}
+              >
+                {CATEGORY_LABELS[template.category]}
+              </span>
+            </div>
+            <p className="text-sm text-neutral-400 leading-relaxed">
+              {template.description}
+            </p>
+          </div>
+          <button
+            onClick={onClose}
+            disabled={isLoading}
+            className="p-1.5 rounded-md text-neutral-400 hover:text-neutral-200 hover:bg-neutral-800 transition-colors disabled:opacity-50"
+          >
+            <svg
+              className="w-5 h-5"
+              fill="none"
+              viewBox="0 0 24 24"
+              stroke="currentColor"
+              strokeWidth={2}
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                d="M6 18L18 6M6 6l12 12"
+              />
+            </svg>
+          </button>
+        </div>
+
+        {/* Workflow Preview */}
+        <div className="flex-1 min-h-0 p-6 bg-neutral-950/50">
+          <div className="w-full h-[50vh] bg-neutral-900 rounded-lg border border-neutral-800 overflow-hidden">
+            <WorkflowPreview workflow={workflow} />
+          </div>
+        </div>
+
+        {/* Footer */}
+        <div className="px-6 py-4 border-t border-neutral-700 bg-neutral-900">
+          <div className="flex items-center justify-between">
+            {/* Metadata */}
+            <div className="flex items-center gap-4">
+              <div className="flex items-center gap-2 text-sm text-neutral-400">
+                <svg
+                  className="w-4 h-4"
+                  fill="none"
+                  viewBox="0 0 24 24"
+                  stroke="currentColor"
+                  strokeWidth={1.5}
+                >
+                  <path
+                    strokeLinecap="round"
+                    strokeLinejoin="round"
+                    d="M3.75 6A2.25 2.25 0 016 3.75h2.25A2.25 2.25 0 0110.5 6v2.25a2.25 2.25 0 01-2.25 2.25H6a2.25 2.25 0 01-2.25-2.25V6zM3.75 15.75A2.25 2.25 0 016 13.5h2.25a2.25 2.25 0 012.25 2.25V18a2.25 2.25 0 01-2.25 2.25H6A2.25 2.25 0 013.75 18v-2.25zM13.5 6a2.25 2.25 0 012.25-2.25H18A2.25 2.25 0 0120.25 6v2.25A2.25 2.25 0 0118 10.5h-2.25a2.25 2.25 0 01-2.25-2.25V6zM13.5 15.75a2.25 2.25 0 012.25-2.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-2.25A2.25 2.25 0 0113.5 18v-2.25z"
+                  />
+                </svg>
+                <span>{nodeCount} nodes</span>
+              </div>
+
+              {/* Tags */}
+              <div className="flex items-center gap-1.5">
+                {template.tags.map((tag) => (
+                  <span
+                    key={tag}
+                    className="px-2 py-0.5 rounded text-xs bg-neutral-800 text-neutral-500"
+                  >
+                    {tag}
+                  </span>
+                ))}
+              </div>
+            </div>
+
+            {/* Actions */}
+            <div className="flex items-center gap-3">
+              <button
+                onClick={onClose}
+                disabled={isLoading}
+                className="px-4 py-2 text-sm font-medium text-neutral-400 hover:text-neutral-200 transition-colors disabled:opacity-50"
+              >
+                Cancel
+              </button>
+              <button
+                onClick={onUseWorkflow}
+                disabled={isLoading}
+                className="px-5 py-2 text-sm font-medium bg-blue-600 hover:bg-blue-500 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed flex items-center gap-2"
+              >
+                {isLoading ? (
+                  <>
+                    <svg
+                      className="w-4 h-4 animate-spin"
+                      fill="none"
+                      viewBox="0 0 24 24"
+                    >
+                      <circle
+                        className="opacity-25"
+                        cx="12"
+                        cy="12"
+                        r="10"
+                        stroke="currentColor"
+                        strokeWidth="4"
+                      />
+                      <path
+                        className="opacity-75"
+                        fill="currentColor"
+                        d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+                      />
+                    </svg>
+                    Loading...
+                  </>
+                ) : (
+                  <>
+                    Use this workflow
+                    <svg
+                      className="w-4 h-4"
+                      fill="none"
+                      viewBox="0 0 24 24"
+                      stroke="currentColor"
+                      strokeWidth={2}
+                    >
+                      <path
+                        strokeLinecap="round"
+                        strokeLinejoin="round"
+                        d="M13.5 4.5L21 12m0 0l-7.5 7.5M21 12H3"
+                      />
+                    </svg>
+                  </>
+                )}
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/quickstart/TemplateExplorerView.tsx

@@ -5,7 +5,7 @@ import { WorkflowFile } from "@/store/workflowStore";
 import { getAllPresets, PRESET_TEMPLATES, getTemplateContent } from "@/lib/quickstart/templates";
 import { QuickstartBackButton } from "./QuickstartBackButton";
 import { TemplateCard } from "./TemplateCard";
-import { WorkflowPreviewModal } from "./WorkflowPreviewModal";
+import { TemplateDetailModal } from "./TemplateDetailModal";
 import { CommunityWorkflowMeta, TemplateCategory, TemplateMetadata } from "@/types/quickstart";
 
 interface TemplateExplorerViewProps {
@@ -31,7 +31,7 @@ export function TemplateExplorerView({
   const [isLoadingList, setIsLoadingList] = useState(true);
   const [loadingWorkflowId, setLoadingWorkflowId] = useState<string | null>(null);
   const [error, setError] = useState<string | null>(null);
-  const [previewTemplateId, setPreviewTemplateId] = useState<string | null>(null);
+  const [selectedTemplateId, setSelectedTemplateId] = useState<string | null>(null);
 
   // Filter state
   const [searchQuery, setSearchQuery] = useState("");
@@ -420,10 +420,7 @@ export function TemplateExplorerView({
                     template={preset}
                     nodeCount={presetMetadata[preset.id]?.nodeCount ?? 0}
                     previewImage={previewImages[preset.id]}
-                    workflow={presetWorkflows[preset.id]}
-                    isLoading={loadingWorkflowId === preset.id}
-                    onClick={() => handlePresetSelect(preset.id)}
-                    onPreviewClick={() => setPreviewTemplateId(preset.id)}
+                    onClick={() => setSelectedTemplateId(preset.id)}
                     disabled={isLoading}
                   />
                 ))}
@@ -597,13 +594,18 @@ export function TemplateExplorerView({
         </div>
       </div>
 
-      {/* Workflow Preview Modal */}
-      {previewTemplateId && presetWorkflows[previewTemplateId] && (
-        <WorkflowPreviewModal
+      {/* Template Detail Modal */}
+      {selectedTemplateId && presetWorkflows[selectedTemplateId] && (
+        <TemplateDetailModal
           isOpen={true}
-          onClose={() => setPreviewTemplateId(null)}
-          templateName={presets.find((p) => p.id === previewTemplateId)?.name || "Template"}
-          workflow={presetWorkflows[previewTemplateId]}
+          onClose={() => setSelectedTemplateId(null)}
+          onUseWorkflow={() => {
+            handlePresetSelect(selectedTemplateId);
+          }}
+          isLoading={loadingWorkflowId === selectedTemplateId}
+          template={presets.find((p) => p.id === selectedTemplateId)!}
+          nodeCount={presetMetadata[selectedTemplateId]?.nodeCount ?? 0}
+          workflow={presetWorkflows[selectedTemplateId]}
         />
       )}
     </div>