fix(tui): reflow layout on terminal resize

tui/src/app.test.ts

@@ -0,0 +1,47 @@
+import { afterEach, describe, expect, test } from "bun:test"
+import { createTestRenderer, type TestRendererSetup } from "@opentui/core/testing"
+
+import { NanobotTui, type AppOptions } from "./app"
+
+const options: AppOptions = {
+  wsUrl: "ws://localhost.invalid/ws",
+  apiUrl: "",
+  apiToken: "",
+  model: "test/model",
+  workspace: "/tmp/nanobot-workspace",
+  version: "test",
+  access: "workspace access",
+}
+
+function occurrences(frame: string, value: string): number {
+  return frame.split(value).length - 1
+}
+
+describe("NanobotTui layout", () => {
+  let setup: TestRendererSetup | undefined
+
+  afterEach(() => setup?.renderer.destroy())
+
+  test("reflows a single retained layout across terminal resizes", async () => {
+    setup = await createTestRenderer({
+      width: 100,
+      height: 30,
+      screenMode: "alternate-screen",
+      consoleMode: "disabled",
+    })
+    NanobotTui.mount(setup.renderer, options)
+
+    for (const [width, height] of [[100, 30], [56, 18], [118, 36]] as const) {
+      setup.resize(width, height)
+      await setup.renderOnce()
+      const frame = setup.captureCharFrame()
+
+      expect(setup.renderer.width).toBe(width)
+      expect(setup.renderer.height).toBe(height)
+      expect(occurrences(frame, "Ask nanobot anything")).toBe(1)
+      expect(occurrences(frame, "Ready")).toBe(0)
+      expect(occurrences(frame, "Connecting…")).toBe(1)
+      expect(occurrences(frame, "nanobot  ·  test/model")).toBe(1)
+    }
+  })
+})