fix(frontend): refine activity layout and input state

frontend/src/shell/AppShell.new-session.test.tsx

@@ -41,6 +41,8 @@ test("New session starts prewarm without delaying composer focus", async () => {
   const composer = screen.getByRole("textbox", { name: /new question/i });
   await waitFor(() => expect(prewarmStarted).toBe(true));
   await waitFor(() => expect(composer).toHaveFocus());
+  expect(composer).toHaveAttribute("data-awaiting-input", "true");
+  expect(composer).toHaveClass("thot-awaiting-input");
 });
 
 test("shows the question and creation timer before POST /sessions resolves, then opens SSE", async () => {
@@ -87,3 +89,12 @@ test("a failed create restores the landing view and preserves the question for r
   expect(useSessionStore.getState().lastUserEntry).toBeNull();
   expect(FakeEventSource.instances).toHaveLength(0);
 });
+
+
+test("marks the composer as awaiting input for a pending freetext gate", () => {
+  useSessionStore.setState({
+    pendingWidget: { id: "free-1", widget: "freetext", title: "Clarify" },
+  });
+  renderShell();
+  expect(screen.getByRole("textbox", { name: /new question/i })).toHaveAttribute("data-awaiting-input", "true");
+});

frontend/src/shell/AppShell.session-mgmt.test.tsx

@@ -168,3 +168,23 @@ test("renaming a group reassigns its members via setSessionGroup", async () => {
   await userEvent.click(screen.getByRole("button", { name: /save/i }));
   await waitFor(() => expect(groupSets).toEqual([{ id: "s1", group: "Cardiologia" }]));
 });
+
+
+test("opening Model activity replaces the session rail with a 40/60 activity and chat layout", async () => {
+  server.use(http.post("http://localhost:8787/sessions/:id/resume", () => new HttpResponse(null, { status: 204 })));
+  wrap();
+  await userEvent.click(await screen.findByText("Attiva uno"));
+  await userEvent.click(await screen.findByRole("button", { name: /resume/i }));
+
+  expect(screen.getByText("Sessions")).toBeInTheDocument();
+  await userEvent.click(screen.getByRole("button", { name: /show model activity/i }));
+
+  const shell = screen.getByTestId("app-shell");
+  expect(shell).toHaveAttribute("data-activity-layout", "open");
+  expect(screen.getByRole("heading", { name: "Model activity" }).closest("aside")).toHaveClass("w-2/5");
+  expect(screen.queryByText("Sessions")).not.toBeInTheDocument();
+
+  await userEvent.click(screen.getByRole("button", { name: /hide model activity/i }));
+  expect(shell).toHaveAttribute("data-activity-layout", "closed");
+  expect(screen.getByText("Sessions")).toBeInTheDocument();
+});

frontend/src/shell/AppShell.tsx

@@ -33,6 +33,7 @@ import { useEffect, useMemo, useRef, useState } from "react";
 export function AppShell() {
   const [activeSessionId, setActiveSessionId] = useState<string | null>(null);
   const [creatingSession, setCreatingSession] = useState(false);
+  const [awaitingQuestion, setAwaitingQuestion] = useState(false);
   const { data: sessions = [] } = useQuery<SessionSummary[]>({
     queryKey: ["sessions"], queryFn: listSessions, refetchInterval: 10_000,
   });
@@ -104,6 +105,7 @@ export function AppShell() {
     // working spinner shows straight away; the backend calls run after.
     setPanelSession(null);
     resetSession();
+    setAwaitingQuestion(false);
     // Optimistic: the resume POST is about to hand the ball to the harness.
     setAgentActive(true);
     setActiveSessionId(id);
@@ -231,6 +233,7 @@ export function AppShell() {
       // explicit “Stop & save” action is allowed to call /close.
       resetSession();
       setActiveSessionId(null);
+      setAwaitingQuestion(false);
     }
     // The final workflow turn ends with the session already finalized on disk:
     // refetch now instead of waiting for the 10s poll, so the completed state
@@ -241,6 +244,7 @@ export function AppShell() {
 
   function startNewSession() {
     resetSession();
+    setAwaitingQuestion(true);
     setCreatingSession(false);
     setActiveSessionId(null);
     // Best effort only: session creation keeps the authoritative readiness gate.
@@ -250,6 +254,7 @@ export function AppShell() {
   }
 
   function beginSessionCreation() {
+    setAwaitingQuestion(false);
     setCreatingSession(true);
   }
 
@@ -258,6 +263,7 @@ export function AppShell() {
     // while useSessionStream opens the durable session's SSE channel.
     setActiveSessionId(id);
     setCreatingSession(false);
+    setAwaitingQuestion(false);
     refresh();
   }
 
@@ -274,11 +280,16 @@ export function AppShell() {
     } finally {
       resetSession();
       setActiveSessionId(null);
+      setAwaitingQuestion(false);
     }
   }
 
   return (
-    <div className="flex h-screen bg-background text-foreground">
+    <div
+      data-testid="app-shell"
+      data-activity-layout={showActivity ? "open" : "closed"}
+      className="flex h-screen bg-background text-foreground"
+    >
       {panelSession && (
         <SessionDocumentsPanel
           session={panelSession}
@@ -289,7 +300,7 @@ export function AppShell() {
       {showActivity && <ModelActivityPanel onClose={() => setShowActivity(false)} />}
 
       {/* Conversation column */}
-      <div className="flex min-w-0 flex-1 flex-col">
+      <div className={["flex min-w-0 flex-col", showActivity ? "w-3/5 shrink-0" : "flex-1"].join(" ")}>
         {activeSessionId && (
           <div className="relative shrink-0 border-b border-border/70 bg-background/80 px-6 py-2.5 backdrop-blur">
             {/* Arrow toggle for the left Model-activity panel: → opens it, ← closes it. */}
@@ -352,6 +363,7 @@ export function AppShell() {
                   onSessionCreateFailed={failSessionCreation}
                   onStop={() => setStopConfirm(true)}
                   inputRef={composerRef}
+                  awaitingInput={awaitingQuestion || pendingWidget?.widget === "freetext"}
                 />
               </div>
               <ComposerFooter />
@@ -361,6 +373,7 @@ export function AppShell() {
       </div>
 
       {/* Right session rail — symmetric to the portal's left sidebar */}
+      {!showActivity && (
         <aside className="flex w-[15vw] shrink-0 flex-col border-l border-border bg-sidebar">
         <div className="relative px-4 pb-3 pt-5 text-center">
           <h1 className="font-heading text-xl font-semibold leading-none tracking-tight text-foreground">
@@ -501,6 +514,7 @@ export function AppShell() {
           )}
         </div>
         </aside>
+      )}
 
       <Toaster />
 

frontend/src/shell/ModelActivityPanel.test.tsx

@@ -54,3 +54,19 @@ test("paragraphs stay separated as distinct blocks", () => {
   expect(second.tagName).toBe("P");
   expect(first).not.toBe(second);
 });
+
+
+test("separates activity updates concatenated after sentence punctuation", () => {
+  useSessionStore.getState().applyEvent({
+    type: "text_delta",
+    text: "Ambiguità principale risolta.Finestra temporale risolta.Terza ambiguità risolta.",
+  });
+  render(<ModelActivityPanel onClose={vi.fn()} />);
+
+  const first = screen.getByText("Ambiguità principale risolta.");
+  const second = screen.getByText("Finestra temporale risolta.");
+  const third = screen.getByText("Terza ambiguità risolta.");
+  expect(first.tagName).toBe("P");
+  expect(second.tagName).toBe("P");
+  expect(third.tagName).toBe("P");
+});

frontend/src/shell/ModelActivityPanel.tsx

@@ -10,6 +10,7 @@ const TAIL_PARAGRAPHS = 5;
 export function formatModelActivity(text: string): string {
   return text
     .replace(/\r\n?/g, "\n")
+    .replace(/([.!?])(?=[A-ZÀ-ÖØ-Þ])/g, "$1\n\n")
     .replace(/^[\t ]*[•‣–]\s+/gm, "- ")
     .replace(/^(\d+)\)\s+/gm, (_, n) => `${n}. `)
     .replace(/\n(?=\S)(?![-*+] |\d+\. |>|`|\|)/g, "\n\n")
@@ -40,7 +41,7 @@ export function ModelActivityPanel({ onClose }: { onClose: () => void }) {
   const source = formatModelActivity(shown.join("\n\n"));
 
   return (
-    <aside className="flex w-[30vw] max-w-[30vw] shrink-0 flex-col border-r border-border bg-sidebar">
+    <aside className="flex w-2/5 shrink-0 flex-col border-r border-border bg-sidebar">
       <div className="flex items-center justify-between border-b border-border/60 px-3 py-3">
         <h2 className="font-heading text-sm font-semibold text-foreground">Model activity</h2>
         <div className="flex items-center gap-1">

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");
+});

frontend/src/shell/SteerInput.tsx

@@ -23,6 +23,8 @@ interface Props {
   onStop?: () => void;
   /** Lets the parent focus the composer (e.g. on "New session"). */
   inputRef?: React.Ref<HTMLTextAreaElement>;
+  /** The workflow is explicitly waiting for text in this composer. */
+  awaitingInput?: boolean;
 }
 
 export function SteerInput({
@@ -32,6 +34,7 @@ export function SteerInput({
   onSessionCreateFailed,
   onStop,
   inputRef,
+  awaitingInput = false,
 }: Props) {
   const [text, setText] = useState("");
   const [busy, setBusy] = useState(false);
@@ -116,8 +119,8 @@ export function SteerInput({
         onKeyDown={handleKeyDown}
         placeholder={sessionId ? "Free steering (!)…" : "Ask a question to start a new session…"}
         aria-label={sessionId ? "Steering" : "New question"}
-        data-awaiting-input={sessionId ? undefined : "true"}
-        className={["max-h-40 flex-1 resize-none rounded-lg px-1 py-1 text-sm leading-relaxed outline-none placeholder:text-muted-foreground", sessionId ? "bg-transparent" : "thot-awaiting-input"].join(" ")}
+        data-awaiting-input={awaitingInput ? "true" : undefined}
+        className={["max-h-40 flex-1 resize-none rounded-lg bg-card px-1 py-1 text-sm leading-relaxed outline-none placeholder:text-muted-foreground", awaitingInput && "thot-awaiting-input"].filter(Boolean).join(" ")}
       />
       <button
         type="button"