fix(desktop): update E2E test helper to use consolidated acpProvidersCatalog field

The onboarding E2E test passed `{ acpProviders: [] }` to the mock
bridge, but the bridge handler was renamed to read
`acpProvidersCatalog` during consolidation. The stale field name was
silently ignored, causing the default catalog (with available
providers) to be returned instead of an empty list.

desktop/tests/e2e/onboarding.spec.ts

@@ -197,7 +197,7 @@ test("page 2 falls back to Doctor guidance when ACP tools are not installed", as
   await installMockBridge(
     page,
     {
-      acpProviders: [],
+      acpProvidersCatalog: [],
     },
     { skipOnboardingSeed: true },
   );

desktop/tests/helpers/bridge.ts

@@ -35,14 +35,6 @@ export const TEST_IDENTITIES = {
 
 type BridgeMode = "mock" | "relay";
 
-type MockAcpProvider = {
-  id: string;
-  label: string;
-  command: string;
-  binaryPath: string;
-  defaultArgs: string[];
-};
-
 type MockCommandAvailability = {
   available?: boolean;
   command?: string;
@@ -50,7 +42,7 @@ type MockCommandAvailability = {
 };
 
 type MockBridgeOptions = {
-  acpProviders?: MockAcpProvider[];
+  acpProvidersCatalog?: Record<string, unknown>[];
   managedAgentPrereqs?: {
     acp?: MockCommandAvailability;
     mcp?: MockCommandAvailability;