fix: animate tool paths in sorted chat mode

Adds animated reveals for file path tool descriptions
Keeps sorted mode tool animations working without extra chat gaps
Preserves file icons, truncation, and click behavior

packages/ui/src/components/chat/MessageList.tsx

@@ -700,6 +700,7 @@ const TurnBlock = React.memo(({
             const isFirstAssistant = assistantIndex === 0;
             const isLastAssistant = assistantIndex === visibleAssistantMessages.length - 1;
             const isActivityOwner = Boolean(activityOwnerMessageId) && message.info.id === activityOwnerMessageId;
+            const hasAnchoredActivitySegment = visibleActivitySegments.some((segment) => segment.anchorMessageId === message.info.id);
             const shouldAttachFullTurnContext = chatRenderMode === 'sorted'
                 ? isAssistantMessage
                 : (isActivityOwner || isFirstAssistant || isLastAssistant);
@@ -722,7 +723,11 @@ const TurnBlock = React.memo(({
                     activityOwnerMessageId,
                     isFirstAssistantInTurn: isFirstAssistant,
                     isLastAssistantInTurn: isLastAssistant,
-                    isWorking: isLastTurn && sessionIsWorking && message.info.id === streamingAssistantMessageId,
+                    isWorking: isLastTurn && sessionIsWorking && (
+                        chatRenderMode === 'sorted'
+                            ? hasAnchoredActivitySegment
+                            : message.info.id === streamingAssistantMessageId
+                    ),
                     hasTools: turn.hasTools,
                     hasReasoning: turn.hasReasoning,
                     ...(shouldAttachFullTurnContext ? {
@@ -777,6 +782,7 @@ const TurnBlock = React.memo(({
             activeStreamingPhase,
             visibleAssistantMessages,
             visibleAssistantIds,
+            visibleActivitySegments,
             activityOwnerMessageId,
             shouldAnimateUserMessage,
             onUserAnimationConsumed,