fix(tui): enable transcript jumps in subagent sessions (#60817)

Co-authored-by: DS <78942835+Tarquinen@users.noreply.github.com>

packages/tui/src/routes/session/index.tsx

@@ -1450,6 +1450,7 @@ export function Session(props: {
   }))
 
   Keymap.createLayer(() => ({
+    mode: "composer",
     enabled: () => renderer.currentFocusedEditor === null,
     bindings: baseAndUnfocusedCommands.map((command) => command.id),
   }))

packages/tui/test/session-subagent-navigation.test.tsx

@@ -0,0 +1,44 @@
+import { expect, test } from "bun:test"
+import { createAppFixture } from "./fixture/app"
+import { directory, json } from "./fixture/tui-client"
+
+test("Home and End navigate a subagent transcript", async () => {
+  const session = {
+    id: "ses_subagent_navigation",
+    parentID: "ses_parent",
+    title: "Subagent",
+    agent: "build",
+    projectID: "proj_test",
+    location: { directory },
+    cost: 0,
+    tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },
+    time: { created: 0, updated: 0 },
+  }
+  const messages = Array.from({ length: 20 }, (_, index) => ({
+    id: `message-${index}`,
+    type: "user",
+    text: `Message ${index}`,
+    time: { created: index },
+  }))
+  await using setup = await createAppFixture({
+    width: 100,
+    height: 30,
+    config: { animations: false, tabs: { mode: "off" } },
+    args: { sessionID: session.id },
+    fetch: (url) => {
+      if (url.pathname === "/api/session") return json({ data: [session], cursor: {} })
+      if (url.pathname === `/api/session/${session.id}`) return json({ data: session })
+      if (url.pathname === `/api/session/${session.id}/message`)
+        return json({ data: messages.toReversed(), cursor: {} })
+      if (url.pathname === `/api/session/${session.id}/inbox`) return json({ data: [] })
+    },
+  })
+  await setup.ready
+  expect(
+    await setup.waitForFrame((frame) => frame.includes("Message 19") && frame.includes("Subagents")),
+  ).not.toContain("Message 0")
+  setup.mockInput.pressKey("HOME")
+  expect(await setup.waitForFrame((frame) => frame.includes("Message 0"))).not.toContain("Message 19")
+  setup.mockInput.pressKey("END")
+  expect(await setup.waitForFrame((frame) => frame.includes("Message 19"))).not.toContain("Message 0")
+})