refactor(sidebar): update sessionMeta handling for session loading logic

- This fixes an issue where the sidebar was showing 6+ even when there were only 5 sessions, due to the hasMore logic not accounting for the case where there are exactly 6 sessions.
It was also showing "Show more sessions" even where there were no more sessions to load.

- This was because `hasMore` was sometimes `undefined` and the logic checked for hasMore !== false, which treated undefined as true.
Now we explicitly check for hasMore === true to determine if there are more sessions to load.

src/components/sidebar/SidebarProjectItem.tsx

@@ -97,7 +97,7 @@ export default function SidebarProjectItem({
 }: SidebarProjectItemProps) {
   const isSelected = selectedProject?.name === project.name;
   const isEditing = editingProject === project.name;
-  const hasMoreSessions = project.sessionMeta?.hasMore !== false;
+  const hasMoreSessions = project.sessionMeta?.hasMore === true;
   const sessionCountDisplay = getSessionCountDisplay(sessions, hasMoreSessions);
   const sessionCountLabel = `${sessionCountDisplay} session${sessions.length === 1 ? '' : 's'}`;
   const taskStatus = getTaskIndicatorStatus(project, mcpServerStatus);

src/components/sidebar/SidebarProjectSessions.tsx

@@ -78,7 +78,7 @@ export default function SidebarProjectSessions({
   }
 
   const hasSessions = sessions.length > 0;
-  const hasMoreSessions = project.sessionMeta?.hasMore !== false;
+  const hasMoreSessions = project.sessionMeta?.hasMore === true;
 
   return (
     <div className="ml-3 space-y-1 border-l border-border pl-3">