fix(home-chat): only shimmer last text item in agent group

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/agent-group.tsx

@@ -33,6 +33,13 @@ export function AgentGroup({
 }: AgentGroupProps) {
   const AgentIcon = getAgentIcon(agentName)
   const hasItems = items.length > 0
+  let lastTextIdx = -1
+  for (let i = items.length - 1; i >= 0; i--) {
+    if (items[i].type === 'text') {
+      lastTextIdx = i
+      break
+    }
+  }
   const toolItems = items.filter(
     (item): item is Extract<AgentGroupItem, { type: 'tool' }> => item.type === 'tool'
   )
@@ -108,7 +115,7 @@ export function AgentGroup({
               <SubagentThinkingBlock
                 key={`text-${idx}`}
                 content={item.content}
-                isStreaming={!!isStreamingProp && duration === undefined}
+                isStreaming={!!isStreamingProp && duration === undefined && idx === lastTextIdx}
                 duration={duration}
               />
             )

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/subagent-thinking-block.tsx

@@ -88,6 +88,7 @@ export function SubagentThinkingBlock({
     }
     if (!isStreaming) {
       setExpanded(false)
+      // Reset so the next streaming session auto-expands by default
       userCollapsedRef.current = false
     }
   }, [isStreaming, hasContent])