feat(locks): show a lock indicator on the lane card (D)

client/src/components/lanes/__tests__/LaneCard.test.tsx

@@ -24,6 +24,9 @@ vi.mock("../../../lib/api", () => ({
       down: vi.fn(),
       preflight: vi.fn().mockResolvedValue({ blocked: [], warnings: [] }),
     },
+    locks: {
+      list: vi.fn(),
+    },
   },
 }));
 
@@ -35,6 +38,8 @@ beforeEach(() => {
   vi.mocked(api.lanes.runtime).mockReset();
   vi.mocked(api.lanes.runtime).mockResolvedValue({ available: false });
 });
+vi.mocked(api.locks.list).mockReset();
+vi.mocked(api.locks.list).mockResolvedValue({ locks: [] });
 
 function makeLane(overrides: Partial<Lane> = {}): Lane {
   return {
@@ -335,3 +340,24 @@ describe("LaneCard — the lane's own application stack", () => {
     expect(screen.getByText(/health check failed/)).toBeInTheDocument();
   });
 });
+
+describe("LaneCard — named locks", () => {
+  it("shows a lock badge when this lane holds a named lock", async () => {
+    vi.mocked(api.locks.list).mockResolvedValue({
+      locks: [{ name: "build", holder: "lane1", since: 0, ageSec: 120 }],
+    });
+    render(<LaneCard lane={makeLane({ slot: 1 })} onAction={vi.fn()} />);
+
+    expect(await screen.findByTestId("lane-locks-1")).toBeInTheDocument();
+    expect(screen.getByText(/lock/i)).toBeInTheDocument();
+  });
+
+  it("shows no lock badge when locks belong to a different lane", async () => {
+    vi.mocked(api.locks.list).mockResolvedValue({
+      locks: [{ name: "build", holder: "lane99", since: 0, ageSec: 120 }],
+    });
+    render(<LaneCard lane={makeLane({ slot: 1 })} onAction={vi.fn()} />);
+
+    expect(screen.queryByTestId("lane-locks-1")).not.toBeInTheDocument();
+  });
+});