fix(tui): restore subtask invocation spacing (#32109)

packages/tui/test/cli/tui/__snapshots__/inline-tool-wrap-snapshot.test.tsx.snap

@@ -70,3 +70,19 @@ exports[`TUI inline tool wrapping separates a subagent group after an expanded r
    ✓ Explore Task — Inspect active task spacing
      ↳ 1 toolcall · 501ms"
 `;
+
+exports[`TUI inline tool wrapping separates a subagent from the previous assistant summary 1`] = `
+"   ▣ Build · Little Frank · 53.1s
+
+   ✓ Build Task — Review changes
+     ↳ 48 toolcalls · 1m 40s"
+`;
+
+exports[`TUI inline tool wrapping separates a subagent from the previous assistant error 1`] = `
+"│
+│  Managed inference requires an active Member plan
+│
+
+   ✓ Build Task — Review changes
+     ↳ 48 toolcalls · 1m 40s"
+`;

packages/tui/test/cli/tui/inline-tool-wrap-snapshot.test.tsx

@@ -134,6 +134,32 @@ function LoadedReadBeforeSubagentFixture() {
   )
 }
 
+function AssistantSummaryBeforeSubagentFixture() {
+  return (
+    <box flexDirection="column" width={72}>
+      <box id="assistant-summary-message-one" paddingLeft={3}>
+        <text>▣ Build · Little Frank · 53.1s</text>
+      </box>
+      <InlineToolRow id="tool-inline-subagent-one" icon="✓" complete={true} pending="" subagent={true}>
+        {"Build Task — Review changes\n↳ 48 toolcalls · 1m 40s"}
+      </InlineToolRow>
+    </box>
+  )
+}
+
+function AssistantErrorBeforeSubagentFixture() {
+  return (
+    <box flexDirection="column" width={72}>
+      <box id="assistant-error-message-one" border={["left"]} paddingTop={1} paddingBottom={1} paddingLeft={2}>
+        <text>Managed inference requires an active Member plan</text>
+      </box>
+      <InlineToolRow id="tool-inline-subagent-one" icon="✓" complete={true} pending="" subagent={true}>
+        {"Build Task — Review changes\n↳ 48 toolcalls · 1m 40s"}
+      </InlineToolRow>
+    </box>
+  )
+}
+
 function StickyScrollFixture(props: { separated: boolean; scroll: (scroll: ScrollBoxRenderable) => void }) {
   return (
     <scrollbox ref={props.scroll} stickyScroll={true} stickyStart="bottom" height={3} width={72}>
@@ -276,6 +302,16 @@ describe("TUI inline tool wrapping", () => {
     expect(await renderFrame(() => <LoadedReadBeforeSubagentFixture />, { width: 72, height: 8 })).toMatchSnapshot()
   })
 
+  test("separates a subagent from the previous assistant summary", async () => {
+    expect(
+      await renderFrame(() => <AssistantSummaryBeforeSubagentFixture />, { width: 72, height: 5 }),
+    ).toMatchSnapshot()
+  })
+
+  test("separates a subagent from the previous assistant error", async () => {
+    expect(await renderFrame(() => <AssistantErrorBeforeSubagentFixture />, { width: 72, height: 7 })).toMatchSnapshot()
+  })
+
   test("updates sticky-bottom geometry when a text separator mounts and unmounts", async () => {
     const [separated, setSeparated] = createSignal(false)
     let scroll: ScrollBoxRenderable | undefined