refactor: simplify session list display

Makes minimal session rows the default
Removes session diff stat badges from navigation surfaces
Keeps expanded session rows in VS Code

packages/ui/src/components/session/sidebar/SessionGroupSection.tsx

@@ -22,6 +22,7 @@ import type { SessionFolder } from '@/stores/useSessionFoldersStore';
 import { useSessionFoldersStore } from '@/stores/useSessionFoldersStore';
 import { useSessionDisplayStore } from '@/stores/useSessionDisplayStore';
 import { openExternalUrl } from '@/lib/url';
+import { isVSCodeRuntime } from '@/lib/desktop';
 import { useI18n } from '@/lib/i18n';
 
 type DeleteFolderConfirm = {
@@ -157,7 +158,8 @@ export function SessionGroupSection(props: Props): React.ReactNode {
   const searchData = hasSessionSearchQuery ? groupSearchDataByGroup.get(group) : null;
   const displayMode = useSessionDisplayStore((state) => state.displayMode);
   const foldersMap = useSessionFoldersStore((state) => state.foldersMap);
-  const isMinimalMode = displayMode === 'minimal';
+  // VS Code always uses the expanded layout (see SessionNodeItem).
+  const isMinimalMode = displayMode === 'minimal' && !isVSCodeRuntime();
   const isCollapsed = hasSessionSearchQuery ? false : collapsedGroups.has(groupKey);
   const maxVisible = hideDirectoryControls ? 10 : 5;
   const nonArchivedVisibleCount = Math.max(maxVisible, visibleSessionCount ?? maxVisible);