fix: import randomUUID from node:crypto for non-secure contexts

crypto.randomUUID() is only available in secure contexts (HTTPS).
When accessing self-hosted sim over HTTP (e.g., http://192.168.x.x),
the global crypto API doesn't expose randomUUID, causing white screen.

Fix: import { randomUUID } from node:crypto instead of relying on
the global crypto.randomUUID().

Affected files:
- tools/langsmith/utils.ts: runId fallback
- executor/handlers/workflow/workflow-handler.ts: instanceId generation

Fixes #3393

Author: guoyangzhen

apps/sim/executor/handlers/workflow/workflow-handler.ts

@@ -1,3 +1,4 @@
+import { randomUUID } from 'node:crypto'
 import { createLogger } from '@sim/logger'
 import { buildNextCallChain, validateCallChain } from '@/lib/execution/call-chain'
 import { snapshotService } from '@/lib/logs/execution/snapshot/service'
@@ -81,7 +82,7 @@ export class WorkflowBlockHandler implements BlockHandler {
 
     // Unique ID per invocation — used to correlate child block events with this specific
     // workflow block execution, preventing cross-iteration child mixing in loop contexts.
-    const instanceId = crypto.randomUUID()
+    const instanceId = randomUUID()
 
     const childCallChain = buildNextCallChain(ctx.callChain || [], workflowId)
     const depthError = validateCallChain(childCallChain)

apps/sim/tools/langsmith/utils.ts

@@ -1,3 +1,4 @@
+import { randomUUID } from 'node:crypto'
 import type { LangsmithRunPayload } from '@/tools/langsmith/types'
 
 interface NormalizedRunPayload {
@@ -20,7 +21,7 @@ const toCompactTimestamp = (startTime?: string): string => {
 }
 
 export const normalizeLangsmithRunPayload = (run: LangsmithRunPayload): NormalizedRunPayload => {
-  const runId = run.id ?? crypto.randomUUID()
+  const runId = run.id ?? randomUUID()
   const traceId = run.trace_id ?? runId
   const startTime = run.start_time ?? new Date().toISOString()
   const dottedOrder = run.dotted_order ?? `${toCompactTimestamp(startTime)}Z${runId}`