fix: address PR feedback for slash commands and test cleanup

packages/cli/src/ui/hooks/useAgentStream.test.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { act } from 'react';
 import type { AgentProtocol } from '@google/gemini-cli-core';
 import { renderHookWithProviders } from '../../test-utils/render.js';
@@ -40,6 +40,10 @@ describe('useAgentStream', () => {
     vi.clearAllMocks();
   });
 
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
   it('should initialize on mount', async () => {
     await renderHookWithProviders(() =>
       useAgentStream({

packages/cli/src/ui/hooks/useAgentStream.ts

@@ -396,6 +396,7 @@ export const useAgentStream = ({
               } else {
                 // 'handled' or other types that don't need LLM submission
                 shouldAddToHistory = false;
+                return;
               }
             }
           }