fix(tui): limit shell list commands to one line (#48184)

Co-authored-by: jlongster <17031+jlongster@users.noreply.github.com>

packages/tui/src/routes/session/composer/shell-tab.tsx

@@ -136,7 +136,7 @@ export function ShellTab(props: { sessionID: string }) {
                     attributes={active() ? TextAttributes.BOLD : undefined}
                     wrapMode="none"
                   >
-                    {shell.command}
+                    {shell.command.split("\n", 1)[0]}
                   </text>
                 </box>
               )

packages/tui/test/cli/tui/composer-keymap.test.tsx

@@ -23,7 +23,7 @@ const sessions = {
   "child-b": session("child-b", "Second", "parent"),
 }
 
-const shells = [shell("sh-a", "bun test"), shell("sh-b", "bun dev")]
+const shells = [shell("sh-a", "bun test"), shell("sh-b", "bun dev"), shell("sh-c", "python3 - <<'PY'\nimport json")]
 
 async function renderComposer(
   defaultTab: "subagents" | "shell",
@@ -191,6 +191,17 @@ test("disabled shell bindings have no component fallbacks", async () => {
   }
 })
 
+test("shell list shows one line per command", async () => {
+  const composer = await renderComposer("shell", {})
+  try {
+    const frame = composer.app.captureCharFrame()
+    expect(frame).toContain("python3 - <<'PY'")
+    expect(frame).not.toContain("import json")
+  } finally {
+    composer.app.renderer.destroy()
+  }
+})
+
 test("configured composer bindings work with a focused textarea", async () => {
   const composer = await renderComposer("subagents", { "composer.shell.kill": "ctrl+u" }, true)
   try {