Collapse completed todo subtrees in widget

src/widget.ts

@@ -1,6 +1,6 @@
 import type { ExtensionContext } from "@earendil-works/pi-coding-agent";
 import type { TaskState } from "./state.ts";
-import { renderProgressHeader, renderTree } from "./ui.ts";
+import { renderProgressHeader, renderWidgetTree } from "./ui.ts";
 
 const WIDGET_ID = "pi-todo-herdr";
 const TIMER_REFRESH_MS = 1000;
@@ -31,7 +31,7 @@ export function updateTaskWidget(
     return {
       render(width: number): string[] {
         const currentTasks = state.list();
-        return [renderProgressHeader(state.stats(), theme, width), ...renderTree(currentTasks, theme, width)];
+        return [renderProgressHeader(state.stats(), theme, width), ...renderWidgetTree(currentTasks, theme, width)];
       },
       invalidate(): void {},
       dispose(): void {