fix(cli): arrêt du spinner Progress à l'état terminal — #157 (QA verte)

Ajoute completeRunningProgress() qui passe les stages started/delta à
completed lors des événements final/error. La ligne Progress conserve son
contenu statique utile mais n'affiche plus l'animation de chargement une
fois le tour terminé.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -1,4 +1,4 @@
-import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
 import { useState } from "react";
 import { describe, expect, it, vi } from "vitest";
 
@@ -296,6 +296,90 @@ describe("CustomAgentChatView", () => {
     await screen.findByText("done");
   });
 
+  it("stops animating running progress rows once the turn reaches a final chunk", async () => {
+    let emitChunk: ((chunk: unknown) => void) | null = null;
+    const agent = {
+      launchAgentChat: vi.fn(),
+      reattachAgentChat: vi.fn(async (sessionId: string) => ({
+        sessionId,
+        scrollback: [],
+      })),
+      sendAgentChat: vi.fn(
+        (_sessionId: string, _prompt: string, onChunk: (chunk: unknown) => void) =>
+          new Promise<void>((resolve) => {
+            emitChunk = (chunk: unknown) => {
+              onChunk(chunk);
+              if ((chunk as { kind?: string }).kind === "final") resolve();
+            };
+          }),
+      ),
+      cancelAgentChat: vi.fn(async () => {}),
+      closeAgentChat: vi.fn(async () => {}),
+    };
+
+    render(
+      <DIProvider
+        gateways={{
+          agent,
+          system: { pickFile: vi.fn(async () => null) },
+        } as unknown as Gateways}
+      >
+        <CustomAgentChatView
+          projectId="project-1"
+          agentId="agent-1"
+          agentName="Worker"
+          profile={profile}
+          cwd="/repo"
+          nodeId="node-1"
+          sessionId="chat-session-1"
+          conversationId="conversation-1"
+          onSessionId={vi.fn()}
+          onConversationId={vi.fn()}
+        />
+      </DIProvider>,
+    );
+
+    await waitFor(() =>
+      expect(agent.reattachAgentChat).toHaveBeenCalledWith(
+        "chat-session-1",
+        expect.any(Function),
+      ),
+    );
+
+    fireEvent.change(screen.getByLabelText(/message CLI custom/), {
+      target: { value: "ship progress UI" },
+    });
+    fireEvent.click(screen.getByRole("button", { name: "Envoyer" }));
+    await waitFor(() => expect(emitChunk).not.toBeNull());
+
+    act(() => {
+      emitChunk?.({
+        kind: "progress",
+        progress: {
+          source: "providerNative",
+          kind: "message",
+          stage: "delta",
+          label: "Analyse",
+          text: "Lecture du contexte disponible.",
+        },
+      });
+    });
+
+    expect(screen.getAllByRole("status", { name: "Loading" }).length).toBeGreaterThan(0);
+    expect(screen.getByText("Progress").parentElement?.textContent).toContain("running");
+
+    act(() => {
+      emitChunk?.({ kind: "final", content: "done" });
+    });
+
+    await screen.findByText("done");
+    await waitFor(() =>
+      expect(screen.queryByRole("status", { name: "Loading" })).toBeNull(),
+    );
+    expect(screen.getByText("Lecture du contexte disponible.")).toBeTruthy();
+    expect(screen.getByText("Progress").parentElement?.textContent).toContain("done");
+  });
+
   it("pastes a clipboard image as a removable preview chip", async () => {
     const agent = {
       launchAgentChat: vi.fn(),