fix: give ai-cad a dedicated shell layout

components/ai-cad/ai-cad-workbench.tsx

@@ -3595,7 +3595,7 @@ export function AiCadWorkbench() {
   }
 
   return (
-    <div className="flex h-full flex-col overflow-hidden bg-[#1b1b1b] text-white">
+    <div className="flex min-h-svh flex-col overflow-hidden bg-[#1b1b1b] text-white">
       <div className="border-white/10 border-b bg-[#252525] px-3 py-2.5 xl:px-4">
         <div className="space-y-2.5">
           <div className="flex flex-col gap-2.5 border-white/10 border-b pb-2.5 xl:flex-row xl:items-center xl:justify-between">

components/chat-shell.tsx

@@ -68,6 +68,7 @@ export function ChatShell({
 }: ChatShellProps) {
   const pathname = usePathname();
   const isLovartHome = pathname === "/" && homeVariant === "lovart";
+  const isAiCadWorkspace = pathname === "/ai-cad";
 
   if (isLovartHome) {
     return <div className="h-svh w-full overflow-y-auto">{children}</div>;
@@ -75,26 +76,38 @@ export function ChatShell({
 
   return (
     <SidebarProvider defaultOpen={!isCollapsed}>
-      <TopNavbar
-        siteName={siteName}
-        siteLogo={siteLogo}
-        siteLogoDark={siteLogoDark}
-        isAdmin={isAdmin}
-        settingsHref={settingsHref}
-        customLinks={customLinks}
-        toolbox1Name={toolbox1Name}
-        toolbox1Enabled={toolbox1Enabled}
-        toolbox2Name={toolbox2Name}
-        toolbox2Enabled={toolbox2Enabled}
-        tutorialVideos={tutorialVideos}
-        tutorialEnabled={tutorialEnabled}
-        rankingEnabled={rankingEnabled}
-        productPlanningEnabled={productPlanningEnabled}
-        agentEnabled={agentEnabled}
-      />
-      <div className="flex h-svh w-full overflow-hidden pl-16 [--sidebar-offset:4rem]">
+      {isAiCadWorkspace ? null : (
+        <TopNavbar
+          agentEnabled={agentEnabled}
+          customLinks={customLinks}
+          isAdmin={isAdmin}
+          productPlanningEnabled={productPlanningEnabled}
+          rankingEnabled={rankingEnabled}
+          settingsHref={settingsHref}
+          siteLogo={siteLogo}
+          siteLogoDark={siteLogoDark}
+          siteName={siteName}
+          toolbox1Enabled={toolbox1Enabled}
+          toolbox1Name={toolbox1Name}
+          toolbox2Enabled={toolbox2Enabled}
+          toolbox2Name={toolbox2Name}
+          tutorialEnabled={tutorialEnabled}
+          tutorialVideos={tutorialVideos}
+        />
+      )}
+      <div
+        className={
+          isAiCadWorkspace
+            ? "flex min-h-svh w-full pl-16 [--sidebar-offset:4rem]"
+            : "flex h-svh w-full overflow-hidden pl-16 [--sidebar-offset:4rem]"
+        }
+      >
         <AppSidebar user={user} />
-        <SidebarInset className="h-full">{children}</SidebarInset>
+        <SidebarInset
+          className={isAiCadWorkspace ? "min-h-svh overflow-visible" : "h-full"}
+        >
+          {children}
+        </SidebarInset>
       </div>
     </SidebarProvider>
   );