feat(cli): repense la timeline de conversation (tools MCP centrés, progress à droite, tours compacts) — #174 (QA verte)

- ToolProgressCard: tools/MCP/délégations centrés, extrait succinct de la demande inter-agent

- ProgressBubble: progress non-outil alignés à droite, clamp 4 lignes (fourLineClamp)

- TurnMarker: marqueurs turn.started/turn.completed compacts et centrés

- Délégations explicites (« Demande à <target> », « Appel inter-agent ») + libellés FR (Terminé)

frontend/src/features/agents/CustomAgentChatView.test.tsx

@@ -252,6 +252,17 @@ describe("CustomAgentChatView", () => {
         scrollback: [],
       })),
       sendAgentChat: vi.fn(async (_sessionId: string, _prompt: string, onChunk) => {
+        onChunk({
+          kind: "progress",
+          progress: {
+            source: "providerNative",
+            kind: "turn",
+            stage: "started",
+            label: "turn.started",
+            provider: "codex",
+            nativeEvent: "turn.started",
+          },
+        });
         onChunk({
           kind: "progress",
           progress: {
@@ -285,6 +296,17 @@ describe("CustomAgentChatView", () => {
             toolName: "idea_ask_agent",
           },
         });
+        onChunk({
+          kind: "progress",
+          progress: {
+            source: "providerNative",
+            kind: "turn",
+            stage: "completed",
+            label: "turn.completed",
+            provider: "codex",
+            nativeEvent: "turn.completed",
+          },
+        });
         onChunk({ kind: "final", content: "done" });
       }),
       cancelAgentChat: vi.fn(async () => {}),
@@ -326,13 +348,19 @@ describe("CustomAgentChatView", () => {
     fireEvent.click(screen.getByRole("button", { name: "Envoyer" }));
 
     await screen.findByText("Progress");
+    expect(screen.getAllByTestId("chat-turn-marker")).toHaveLength(2);
+    expect(screen.getByText("turn.started")).toBeTruthy();
+    expect(screen.getByText("turn.completed")).toBeTruthy();
+    expect(screen.getByText("Progress").closest("[data-testid='chat-progress-status']")).toBeTruthy();
     expect(screen.getByText("Analyse")).toBeTruthy();
     expect(screen.getByText("Lecture du contexte disponible.")).toBeTruthy();
     expect(screen.getByText("MCP")).toBeTruthy();
+    expect(screen.getByText("MCP").closest("[data-testid='chat-tool-progress']")).toBeTruthy();
     expect(screen.getByText("idea_ticket_read")).toBeTruthy();
-    expect(screen.getByText("Délégation")).toBeTruthy();
-    expect(screen.getByText("target=QA task=Valider le rendu progress")).toBeTruthy();
-    await screen.findByText("done");
+    expect(screen.getByText("Demande à QA")).toBeTruthy();
+    expect(screen.getByText("Demande à QA").closest("[data-testid='chat-tool-progress']")).toBeTruthy();
+    expect(screen.getByText("Valider le rendu progress")).toBeTruthy();
+    expect((await screen.findAllByText("done")).length).toBeGreaterThan(0);
   });
 
   it("renders available pre-MCP progress before the first MCP card", async () => {
@@ -529,8 +557,9 @@ describe("CustomAgentChatView", () => {
     });
 
     await screen.findByText("done");
-    expect(screen.getAllByText("Délégation")).toHaveLength(2);
-    expect(screen.getByText("target=QA task=validate")).toBeTruthy();
+    expect(screen.getByText("Demande à QA")).toBeTruthy();
+    expect(screen.getByText("validate")).toBeTruthy();
+    expect(screen.getByText("Appel inter-agent")).toBeTruthy();
     expect(screen.getByText("reply delivered")).toBeTruthy();
     expect(screen.queryByText("Tool")).toBeNull();
     await waitFor(() =>