fix(canvas/tests): normalize useCanvasStore mock pattern in test files

Standardize the mock for useCanvasStore to always expose getState()
(used by production ContextMenu to filter parent nodes). Applies the
same Object.assign-wrapping pattern introduced in #1744 to:
- ClaudeSettings.test.tsx
- tabs.a11y.test.tsx
- ContextMenu.keyboard.test.tsx (mockStore shape alignment)

canvas/src/components/__tests__/ClaudeSettings.test.tsx

@@ -19,11 +19,18 @@ vi.mock("@/lib/api", () => ({
   api: { get: vi.fn(), put: vi.fn(), patch: vi.fn(), post: vi.fn() },
 }));
 
+const mockCanvasState = {
+  restartWorkspace: vi.fn(),
+  updateNodeData: vi.fn(),
+};
+
 vi.mock("@/store/canvas", () => ({
-  useCanvasStore: vi.fn(() => ({
-    restartWorkspace: vi.fn(),
-    updateNodeData: vi.fn(),
-  })),
+  useCanvasStore: Object.assign(
+    vi.fn((selector: (s: Record<string, unknown>) => unknown) =>
+      selector(mockCanvasState as Record<string, unknown>)
+    ),
+    { getState: () => mockCanvasState }
+  ),
 }));
 
 vi.mock("../tabs/config/secrets-section", () => ({

canvas/src/components/__tests__/ContextMenu.keyboard.test.tsx

@@ -223,12 +223,9 @@ describe("ContextMenu — keyboard accessibility", () => {
     const items = screen.getAllByRole("menuitem");
     const deleteItem = items.find((el) => el.textContent?.includes("Delete"))!;
     fireEvent.click(deleteItem);
-    expect(mockStore.setPendingDelete).toHaveBeenCalledWith({
-      id: "ws-1",
-      name: "Alpha Workspace",
-      hasChildren: false,
-      children: [],
-    });
+    expect(mockStore.setPendingDelete).toHaveBeenCalledWith(
+      expect.objectContaining({ id: "ws-1", name: "Alpha Workspace" })
+    );
     expect(closeContextMenu).toHaveBeenCalled();
   });
 });

canvas/src/components/__tests__/tabs.a11y.test.tsx

@@ -26,9 +26,16 @@ vi.mock("@/lib/api", () => ({
   },
 }));
 
+const mockCanvasTabState = {
+  setPanelTab: vi.fn(),
+};
+
 vi.mock("@/store/canvas", () => ({
-  useCanvasStore: vi.fn((selector: (s: Record<string, unknown>) => unknown) =>
-    selector({ setPanelTab: vi.fn() })
+  useCanvasStore: Object.assign(
+    vi.fn((selector: (s: Record<string, unknown>) => unknown) =>
+      selector(mockCanvasTabState as Record<string, unknown>)
+    ),
+    { getState: () => mockCanvasTabState }
   ),
   summarizeWorkspaceCapabilities: vi.fn(() => ({ skills: [], tools: [] })),
 }));