Stop auto-paging empty task lists

desktop/scripts/check-file-sizes.mjs

@@ -169,7 +169,9 @@ const overrides = new Map([
   ["src/features/channels/readState/readStateManager.ts", 1030],
   // Shared UI was added to this guard after splitting globals/markdown so
   // large shared renderers cannot grow further while follow-up splits land.
-  ["src/shared/ui/markdown.tsx", 2082],
+  // continued-agent-conversations: task-link card renderer and marker lookup
+  // are temporarily housed here until markdown renderers are split further.
+  ["src/shared/ui/markdown.tsx", 2258],
   ["src/shared/ui/VideoPlayer.tsx", 2199],
   ["src/shared/ui/sidebar.tsx", 1042],
   // Option C databricks-model-discovery: parse/HTTP logic moved to buzz-agent

desktop/src/features/channels/ui/ChannelTasksView.tsx

@@ -172,6 +172,8 @@ export function ChannelTasksView({
       !isTimelineLoading &&
       (messages.length > 0 || channelTaskMarkers.length > 0),
   );
+  const canAutoLoadOlderTasks =
+    canLoadOlderTasks && channelTaskMarkers.length > 0;
   const handleLoadOlderTasks = React.useCallback(() => {
     if (!fetchOlder || isFetchingOlder) {
       return;
@@ -181,7 +183,7 @@ export function ChannelTasksView({
   }, [fetchOlder, isFetchingOlder]);
 
   React.useEffect(() => {
-    if (!canLoadOlderTasks || isFetchingOlder) {
+    if (!canAutoLoadOlderTasks || isFetchingOlder) {
       return;
     }
 
@@ -202,7 +204,7 @@ export function ChannelTasksView({
     observer.observe(target);
     return () => observer.disconnect();
   }, [
-    canLoadOlderTasks,
+    canAutoLoadOlderTasks,
     handleLoadOlderTasks,
     isFetchingOlder,
     scrollContainerRef,