fix(frontend): refine activity layout and input state

frontend/src/shell/SteerInput.test.tsx

@@ -67,3 +67,18 @@ test("does not POST when input is empty", async () => {
   await new Promise((r) => setTimeout(r, 50));
   expect(called).toBe(false);
 });
+
+
+test("keeps the new-question composer white by default", () => {
+  render(<SteerInput sessionId={null} />);
+  const input = screen.getByRole("textbox", { name: /new question/i });
+  expect(input).not.toHaveAttribute("data-awaiting-input");
+  expect(input).not.toHaveClass("thot-awaiting-input");
+});
+
+test("marks the composer as awaiting input only when requested", () => {
+  render(<SteerInput sessionId={null} awaitingInput />);
+  const input = screen.getByRole("textbox", { name: /new question/i });
+  expect(input).toHaveAttribute("data-awaiting-input", "true");
+  expect(input).toHaveClass("thot-awaiting-input");
+});