fix(tui): la bascule TUI native <-> CLI custom ne déclenche plus de faux conflit de visibilité (#189)

frontend/src/features/layout/LayoutGrid.chat.test.tsx

@@ -159,7 +159,7 @@ describe("LayoutGrid custom agent CLI (#147)", () => {
     await waitFor(() =>
       expect(screen.getByRole("alertdialog", { name: "Confirmer le changement de CLI" })).toBeTruthy(),
     );
-    fireEvent.click(screen.getByText("Arrêter et relancer"));
+    fireEvent.click(screen.getByText("Basculer"));
     await waitFor(() =>
       expect(screen.getByTestId("custom-agent-chat-view")).toBeTruthy(),
     );
@@ -264,7 +264,7 @@ describe("LayoutGrid custom agent CLI (#147)", () => {
     await waitFor(() =>
       expect(screen.getByRole("alertdialog", { name: "Confirmer le changement de CLI" })).toBeTruthy(),
     );
-    fireEvent.click(screen.getByText("Arrêter et relancer"));
+    fireEvent.click(screen.getByText("Basculer"));
 
     await waitFor(() =>
       expect(closeChat).toHaveBeenCalledWith(expect.stringMatching(/^mock-agent-chat-/)),
@@ -273,13 +273,26 @@ describe("LayoutGrid custom agent CLI (#147)", () => {
     await waitFor(() => expect(screen.getByTestId("terminal-view")).toBeTruthy());
   });
 
-  it("requires confirmation before switching a live native TUI session", async () => {
-    renderGrid(await seeded(structuredProfile));
+  it("switches a live native TUI session to custom CLI without stopping it first (#189)", async () => {
+    const gateways = await seeded(structuredProfile);
+    const agent = gateways.agent as MockAgentGateway;
+    const terminal = gateways.terminal as MockTerminalGateway;
+    const layout = gateways.layout as MockLayoutGateway;
+    const leafId = leaves(await layout.loadLayout("p1"))[0].id;
+    const stopLive = vi.spyOn(agent, "stopLiveAgent");
+    const closeTerminal = vi.spyOn(terminal, "closeTerminal");
+    const launchChat = vi.spyOn(agent, "launchAgentChat");
+
+    renderGrid(gateways);
 
     await waitFor(() => expect(screen.getByText("CLI custom")).toBeTruthy());
     await waitFor(() =>
       expect(screen.getByTestId("terminal-view")).toBeTruthy(),
     );
+    await waitFor(async () => {
+      const updated = await layout.loadLayout("p1");
+      expect(leaves(updated)[0].session).toMatch(/^mock-agent-session-/);
+    });
 
     fireEvent.click(screen.getByText("CLI custom"));
 
@@ -288,10 +301,18 @@ describe("LayoutGrid custom agent CLI (#147)", () => {
     );
     expect(screen.getByText(/Une reprise est possible/)).toBeTruthy();
 
-    fireEvent.click(screen.getByText("Arrêter et relancer"));
+    fireEvent.click(screen.getByText("Basculer"));
     await waitFor(() =>
       expect(screen.getByTestId("custom-agent-chat-view")).toBeTruthy(),
     );
+    expect(stopLive).not.toHaveBeenCalled();
+    expect(closeTerminal).not.toHaveBeenCalled();
+    await waitFor(() => expect(launchChat).toHaveBeenCalled());
+    expect(launchChat.mock.calls.at(-1)?.[2]).toMatchObject({ nodeId: leafId });
+    await waitFor(async () => {
+      const updated = await layout.loadLayout("p1");
+      expect(leaves(updated)[0].session).toMatch(/^mock-agent-chat-/);
+    });
   });
 
   it("keeps a restored custom CLI mode while the agent/profile catalog is still loading (#149)", async () => {

frontend/src/features/layout/LayoutGrid.tsx

@@ -701,8 +701,13 @@ function LeafView({
     await vm.setSession(id, nextSession);
   }
 
-  async function stopCurrentSessionForSwitch(): Promise<void> {
+  async function prepareSessionForModeSwitch(target: AgentCellMode): Promise<void> {
     if (!session) return;
+    if (target === "custom") {
+      await setSessionWithInstrumentation("mode-switch", null);
+      refreshLive();
+      return;
+    }
     if (cellMode === "custom" && agentGateway?.closeAgentChat) {
       await agentGateway.closeAgentChat(session);
     } else if (agentId && agentGateway?.stopLiveAgent) {
@@ -721,7 +726,7 @@ function LeafView({
     if (!target) return;
     setBusyNotice(null);
     try {
-      await stopCurrentSessionForSwitch();
+      await prepareSessionForModeSwitch(target);
       setCellMode(target);
       setPendingModeSwitch(null);
     } catch (err) {
@@ -1522,16 +1527,16 @@ function LeafView({
               Changer de CLI agent
             </h2>
             <p style={{ margin: "8px 0 0", fontSize: 12, color: "var(--color-content-muted, #9a9a9a)" }}>
-              La session courante va être arrêtée avant de relancer{" "}
+              IdeA va basculer cette cellule vers{" "}
               {pendingModeSwitch.target === "custom"
                 ? "la CLI custom"
                 : "la TUI native"}
-              .
+              {" "}et reprendre la session depuis cette surface.
             </p>
             <p style={{ margin: "8px 0 0", fontSize: 12, color: "var(--color-warning, #d49b3a)" }}>
               {conversationId
                 ? "Une reprise est possible si le profil et le backend conservent cette conversation."
-                : "Aucune conversation reprenable n'est enregistrée pour cette cellule; la relance repartira à neuf."}
+                : "Aucune conversation reprenable n'est enregistrée pour cette cellule; la bascule repartira à neuf si le backend ne peut pas reprendre."}
             </p>
             <div
               style={{
@@ -1567,7 +1572,7 @@ function LeafView({
                   cursor: "pointer",
                 }}
               >
-                Arrêter et relancer
+                Basculer
               </button>
             </div>
           </div>