fix(deploy): skip expensive state merge when deployedState is null

Avoid running mergeSubblockStateWithValues on every render for
non-deployed workflows where changeDetected always returns false.

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/deploy/hooks/use-change-detection.ts

@@ -98,7 +98,7 @@ export function useChangeDetection({
   const needsClientFallback = serverNeedsRedeployment === undefined && !isServerLoading
 
   const currentState = useMemo((): WorkflowState | null => {
-    if (!needsClientFallback || !workflowId) return null
+    if (!needsClientFallback || !workflowId || !deployedState) return null
 
     const mergedBlocks = mergeSubblockStateWithValues(blocks, subBlockValues ?? {})
 
@@ -112,6 +112,7 @@ export function useChangeDetection({
   }, [
     needsClientFallback,
     workflowId,
+    deployedState,
     blocks,
     edges,
     loops,