fix(canvas): pass ?cascade=true to Pause/Resume endpoints

PR #2122 makes workspace Pause/Resume cascade opt-in via ?cascade=true.
Without this parameter, pausing/resuming a workspace with descendants
returns 409 Conflict, breaking the Canvas ContextMenu and batch-pause
flows that currently depend on implicit cascade behavior.

Add ?cascade=true to all Canvas callers so the existing UX behavior
is preserved when #2122 lands.

Refs: #2122
/sop-ack

canvas/src/components/ContextMenu.tsx

@@ -172,7 +172,7 @@ export function ContextMenu() {
     const nodeId = contextMenu.nodeId;
     closeContextMenu();
     try {
-      await api.post(`/workspaces/${nodeId}/pause`, {});
+      await api.post(`/workspaces/${nodeId}/pause?cascade=true`, {});
       updateNodeData(nodeId, { status: "paused" });
     } catch (e) {
       showToast("Pause failed", "error");
@@ -184,7 +184,7 @@ export function ContextMenu() {
     const nodeId = contextMenu.nodeId;
     closeContextMenu();
     try {
-      await api.post(`/workspaces/${nodeId}/resume`, {});
+      await api.post(`/workspaces/${nodeId}/resume?cascade=true`, {});
       updateNodeData(nodeId, { status: "provisioning" });
     } catch (e) {
       showToast("Resume failed", "error");

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

@@ -385,7 +385,7 @@ describe("ContextMenu — item actions", () => {
     render(<ContextMenu />);
     fireEvent.click(screen.getByRole("menuitem", { name: /pause/i }));
     await act(async () => { /* flush */ });
-    expect(mockPost).toHaveBeenCalledWith("/workspaces/n1/pause", {});
+    expect(mockPost).toHaveBeenCalledWith("/workspaces/n1/pause?cascade=true", {});
     expect(mockStoreState.updateNodeData).toHaveBeenCalledWith("n1", { status: "paused" });
   });
 
@@ -395,7 +395,7 @@ describe("ContextMenu — item actions", () => {
     render(<ContextMenu />);
     fireEvent.click(screen.getByRole("menuitem", { name: /resume/i }));
     await act(async () => { /* flush */ });
-    expect(mockPost).toHaveBeenCalledWith("/workspaces/n1/resume", {});
+    expect(mockPost).toHaveBeenCalledWith("/workspaces/n1/resume?cascade=true", {});
   });
 });
 

canvas/src/store/canvas.ts

@@ -324,7 +324,7 @@ export const useCanvasStore = create<CanvasState>((set, get) => ({
   batchPause: async () => {
     const ids = Array.from(get().selectedNodeIds);
     const results = await Promise.allSettled(
-      ids.map((id) => api.post(`/workspaces/${id}/pause`))
+      ids.map((id) => api.post(`/workspaces/${id}/pause?cascade=true`))
     );
     const failed: string[] = [];
     results.forEach((r, i) => {