fix(frontend): address static demo PR review comments

frontend/src/app/workspace/chats/[thread_id]/layout.tsx

@@ -1,8 +1,12 @@
+import { isStaticWebsiteOnly } from "@/core/static-mode";
 import { DEMO_THREAD_IDS } from "@/core/threads/static-demo";
 
 import { ChatProviders } from "./providers";
 
 export function generateStaticParams() {
+  if (!isStaticWebsiteOnly()) {
+    return [];
+  }
   return DEMO_THREAD_IDS.map((thread_id) => ({ thread_id }));
 }
 

frontend/src/components/workspace/artifacts/artifact-file-detail.tsx

@@ -325,11 +325,7 @@ export function ArtifactFilePreview({
       <iframe
         className="size-full"
         title="Artifact preview"
-        sandbox={
-          isWriteFile
-            ? "allow-scripts allow-forms"
-            : "allow-scripts allow-forms allow-same-origin"
-        }
+        sandbox="allow-scripts allow-forms"
         src={isWriteFile ? undefined : htmlPreviewUrl}
         srcDoc={isWriteFile ? content : undefined}
       />

frontend/src/core/artifacts/utils.ts

@@ -13,7 +13,10 @@ export function urlOfArtifact({
   download?: boolean;
   isMock?: boolean;
 }) {
-  if (isMock || isStaticWebsiteOnly()) {
+  if (isStaticWebsiteOnly()) {
+    return staticDemoArtifactURL({ filepath, threadId, download });
+  }
+  if (isMock) {
     return `${getBackendBaseURL()}/mock/api/threads/${threadId}/artifacts${filepath}${download ? "?download=true" : ""}`;
   }
   return `${getBackendBaseURL()}/api/threads/${threadId}/artifacts${filepath}${download ? "?download=true" : ""}`;
@@ -25,7 +28,20 @@ export function extractArtifactsFromThread(thread: AgentThread) {
 
 export function resolveArtifactURL(absolutePath: string, threadId: string) {
   if (isStaticWebsiteOnly()) {
-    return `${getBackendBaseURL()}/mock/api/threads/${threadId}/artifacts${absolutePath}`;
+    return staticDemoArtifactURL({ filepath: absolutePath, threadId });
   }
   return `${getBackendBaseURL()}/api/threads/${threadId}/artifacts${absolutePath}`;
 }
+
+function staticDemoArtifactURL({
+  filepath,
+  threadId,
+  download = false,
+}: {
+  filepath: string;
+  threadId: string;
+  download?: boolean;
+}) {
+  const demoPath = filepath.replace(/^\/mnt\//, "/");
+  return `${getBackendBaseURL()}/demo/threads/${threadId}${demoPath}${download ? "?download=true" : ""}`;
+}