fix(workstate): normalisation du work-state pour éviter l'onglet Work vide

Normalise l'état Work pour empêcher l'affichage d'un onglet Work vide.

QA VERT : tsc --noEmit exit 0 ; vitest run 42 fichiers / 407 tests passed.

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

frontend/src/features/workstate/workstate.test.tsx

@@ -10,7 +10,10 @@ import {
 } from "@/adapters/mock";
 import { leaves } from "@/features/layout/layout";
 import type { Gateways } from "@/ports";
-import { ProjectWorkStatePanel } from "./ProjectWorkStatePanel";
+import {
+  ProjectWorkStatePanel,
+  WorkStatePanelErrorBoundary,
+} from "./ProjectWorkStatePanel";
 
 const PROJECT_ID = "project-work-state-test";
 
@@ -173,7 +176,7 @@ describe("ProjectWorkStatePanel", () => {
     );
   });
 
-  it("normalizes mock work state without tickets", async () => {
+  it("renders a legacy agent without tickets", async () => {
     const workState = new MockWorkStateGateway();
     workState._setProjectWorkState(PROJECT_ID, {
       agents: [
@@ -186,20 +189,42 @@ describe("ProjectWorkStatePanel", () => {
       ],
     });
 
+    renderPanel(workState);
+
+    expect(await screen.findByText("Legacy")).toBeTruthy();
+    expect(screen.getByText("Offline")).toBeTruthy();
+    expect(screen.getByText("Idle")).toBeTruthy();
+    expect(screen.queryByLabelText("Legacy tickets")).toBeNull();
+  });
+
+  it("normalizes missing top-level work state arrays", async () => {
+    const workState = new MockWorkStateGateway();
+    workState._setProjectWorkState(PROJECT_ID, {});
+
     await expect(workState.getProjectWorkState(PROJECT_ID)).resolves.toEqual({
-      agents: [
-        {
-          agentId: "agent-6",
-          name: "Legacy",
-          profileId: "gemini",
-          busy: { state: "idle" },
-          tickets: [],
-        },
-      ],
+      agents: [],
       conversations: [],
     });
   });
 
+  it("renders an error fallback instead of blanking the app when Work throws", () => {
+    function BrokenWorkPanel(): JSX.Element {
+      throw new Error("render exploded");
+    }
+
+    render(
+      <WorkStatePanelErrorBoundary>
+        <BrokenWorkPanel />
+      </WorkStatePanelErrorBoundary>,
+    );
+
+    expect(screen.getByRole("alert").textContent).toContain(
+      "Work panel failed to render.",
+    );
+    expect(screen.getByText("render exploded")).toBeTruthy();
+    expect(screen.getByRole("button", { name: "Retry" })).toBeTruthy();
+  });
+
   it("renders conversation objective and summary joined by conversation id", async () => {
     const workState = new MockWorkStateGateway();
     workState._setProjectWorkState(PROJECT_ID, {