feat(sidebar): add single-project display mode

packages/ui/src/lib/api/types.ts

@@ -643,6 +643,10 @@ export interface SettingsPayload {
   opencodeBinary?: string;
   projects?: ProjectEntry[];
   activeProjectId?: string;
+  sidebarProjectDisplayMode?: 'all' | 'single';
+  sidebarSessionGroupingMode?: 'by-worktree' | 'flat';
+  sidebarProjectSortOrder?: 'manual' | 'a-z' | 'z-a' | 'date-added' | 'recent';
+  sidebarShowRecentSection?: boolean;
   securityScopedBookmarks?: string[];
   pinnedDirectories?: string[];
   showReasoningTraces?: boolean;