fix(docs): correct delivery headers and preview details (#9042)

Author: waleedlatif1

apps/docs/app/llms.txt/route.ts

@@ -37,7 +37,7 @@ Sim is the open-source AI workspace where teams build, deploy, and manage AI age
 
 ## Calling the Sim API
 
-- Base URL: \`${SIM_SITE_URL}\`. Every endpoint is under \`/api\`; there is no \`api.sim.ai\` host.
+- Sim Cloud base URL: \`${SIM_SITE_URL}\`. For self-hosted deployments, use your deployment's origin instead, including in the example below. Every endpoint is under \`/api\`; there is no \`api.sim.ai\` host.
 - Run a deployed workflow: \`POST ${SIM_SITE_URL}/api/v2/workflows/{workflowId}/execute\` with a JSON body like \`{ "input": { "fieldName": "value" } }\`.
 - Authenticate API keys with the \`X-API-Key\` header. \`Authorization: Bearer\` accepts only Sim OAuth access tokens, never API keys.
 - Responses wrap the payload in \`data\`. A synchronous run returns \`200 { "data": { "runId", "status", "output", ... } }\`; with \`"async": true\` in the body it returns \`202 { "data": { "runId", "statusUrl" } }\` and you poll \`statusUrl\`.

apps/docs/components/ui/tabs.tsx

@@ -16,7 +16,7 @@ export function Tabs({ className, ...props }: TabsProps) {
     <FumadocsTabs
       {...props}
       className={cn(
-        'min-w-0 scroll-mt-[calc(var(--fd-docs-row-3,0px)+1rem)] border-[var(--border)] [&>[role=tablist]>button]:font-normal! max-sm:[&>[role=tablist]>button]:min-h-11 [&>[role=tablist]]:min-w-0 [&>[role=tablist]]:[scrollbar-width:thin]! max-sm:[&>[role=tablist]]:min-h-14',
+        'min-w-0 scroll-mt-[calc(var(--fd-docs-row-3,0px)+1rem)] border-[var(--border)] [&>[role=tablist]>button]:font-normal! max-sm:[&>[role=tablist]>button]:min-h-11 [&>[role=tablist]]:min-w-0 [&>[role=tablist]]:[scrollbar-width:thin] max-sm:[&>[role=tablist]]:min-h-14',
         className
       )}
     />

apps/docs/components/workflow-preview/workflow-preview.tsx

@@ -109,6 +109,7 @@ const SELECT_TITLES = new Set([
   'Operation',
   'Method',
   'Unit',
+  'Event',
   'Event type',
   'Validation',
   'Account',

apps/docs/proxy.ts

@@ -17,12 +17,14 @@ export default function proxy(request: NextRequest) {
 
     if (result) {
       const response = NextResponse.rewrite(new URL(result, request.nextUrl))
-      response.headers.set('Vary', 'Accept')
+      response.headers.append('Vary', 'Accept')
       return response
     }
   }
 
-  return NextResponse.next()
+  const response = NextResponse.next()
+  response.headers.append('Vary', 'Accept')
+  return response
 }
 
 export const config = {