Use latest user message time for thread timestamps

apps/web/src/components/CommandPalette.logic.ts

@@ -114,7 +114,9 @@ export function buildThreadActionItems(input: {
       searchTerms: [thread.title, projectTitle ?? "", thread.branch ?? ""],
       title: thread.title,
       description: descriptionParts.join(" · "),
-      timestamp: formatRelativeTimeLabel(thread.updatedAt ?? thread.createdAt),
+      timestamp: formatRelativeTimeLabel(
+        thread.latestUserMessageAt ?? thread.updatedAt ?? thread.createdAt,
+      ),
       icon: input.icon,
       run: async () => {
         await input.runThread(thread);

apps/web/src/components/Sidebar.tsx

@@ -745,7 +745,9 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThreadRowP
                         : "text-muted-foreground/40"
                     }`}
                   >
-                    {formatRelativeTimeLabel(thread.updatedAt ?? thread.createdAt)}
+                    {formatRelativeTimeLabel(
+                      thread.latestUserMessageAt ?? thread.updatedAt ?? thread.createdAt,
+                    )}
                   </span>
                 )}
               </span>
@@ -1101,6 +1103,11 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
       ),
     [allSidebarThreads],
   );
+  // Keep a ref so callbacks can read the latest map without appearing in
+  // dependency arrays (avoids invalidating every thread-row memo on each
+  // thread-list change).
+  const sidebarThreadByKeyRef = useRef(sidebarThreadByKey);
+  sidebarThreadByKeyRef.current = sidebarThreadByKey;
   // All threads from the representative + other member environments are
   // already fetched into allSidebarThreads, so we can use them directly.
   const projectThreads = allSidebarThreads;
@@ -1444,7 +1451,7 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
 
       if (clicked === "mark-unread") {
         for (const threadKey of threadKeys) {
-          const thread = sidebarThreadByKey.get(threadKey);
+          const thread = sidebarThreadByKeyRef.current.get(threadKey);
           markThreadUnread(threadKey, thread?.latestTurn?.completedAt);
         }
         clearSelection();
@@ -1465,7 +1472,7 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
 
       const deletedThreadKeys = new Set(threadKeys);
       for (const threadKey of threadKeys) {
-        const thread = sidebarThreadByKey.get(threadKey);
+        const thread = sidebarThreadByKeyRef.current.get(threadKey);
         if (!thread) continue;
         await deleteThread(scopeThreadRef(thread.environmentId, thread.id), {
           deletedThreadKeys,
@@ -1479,7 +1486,6 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
       deleteThread,
       markThreadUnread,
       removeFromSelection,
-      sidebarThreadByKey,
     ],
   );
 
@@ -1608,12 +1614,7 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
       const api = readLocalApi();
       if (!api) return;
       const threadKey = scopedThreadKey(threadRef);
-      const thread =
-        projectThreads.find(
-          (projectThread) =>
-            projectThread.environmentId === threadRef.environmentId &&
-            projectThread.id === threadRef.threadId,
-        ) ?? null;
+      const thread = sidebarThreadByKeyRef.current.get(threadKey) ?? null;
       if (!thread) return;
       const threadWorkspacePath = thread.worktreePath ?? project.cwd ?? null;
       const clicked = await api.contextMenu.show(
@@ -1675,7 +1676,6 @@ const SidebarProjectItem = memo(function SidebarProjectItem(props: SidebarProjec
       deleteThread,
       markThreadUnread,
       project.cwd,
-      projectThreads,
     ],
   );
 

apps/web/src/hooks/useThreadActions.ts

@@ -2,7 +2,7 @@ import { parseScopedThreadKey, scopeProjectRef, scopeThreadRef } from "@t3tools/
 import { type ScopedThreadRef, ThreadId } from "@t3tools/contracts";
 import { useQueryClient } from "@tanstack/react-query";
 import { useRouter } from "@tanstack/react-router";
-import { useCallback } from "react";
+import { useCallback, useRef } from "react";
 
 import { getFallbackThreadIdAfterDelete } from "../components/Sidebar.logic";
 import { useComposerDraftStore } from "../composerDraftStore";
@@ -33,6 +33,12 @@ export function useThreadActions() {
   const clearTerminalState = useTerminalStateStore((state) => state.clearTerminalState);
   const router = useRouter();
   const { handleNewThread } = useNewThreadHandler();
+  // Keep a ref so archiveThread can call handleNewThread without appearing in
+  // its dependency array — handleNewThread is inherently unstable (depends on
+  // the projects list) and would otherwise cascade new references into every
+  // sidebar row via archiveThread → attemptArchiveThread.
+  const handleNewThreadRef = useRef(handleNewThread);
+  handleNewThreadRef.current = handleNewThread;
   const queryClient = useQueryClient();
 
   const resolveThreadTarget = useCallback((target: ScopedThreadRef) => {
@@ -73,10 +79,10 @@ export function useThreadActions() {
         currentRouteThreadRef?.threadId === threadRef.threadId &&
         currentRouteThreadRef.environmentId === threadRef.environmentId
       ) {
-        await handleNewThread(scopeProjectRef(thread.environmentId, thread.projectId));
+        await handleNewThreadRef.current(scopeProjectRef(thread.environmentId, thread.projectId));
       }
     },
-    [getCurrentRouteThreadRef, handleNewThread, resolveThreadTarget],
+    [getCurrentRouteThreadRef, resolveThreadTarget],
   );
 
   const unarchiveThread = useCallback(async (target: ScopedThreadRef) => {