fix(chat): simplify pending tool activity label

Author: Sg312

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/agent-group.test.ts

@@ -341,7 +341,7 @@ describe('AgentGroup inline main activity', () => {
         act(() => vi.advanceTimersByTime(1000))
         return container.textContent
       }
-      expect(render({}, 'executing')).toBe('Preparing tool call…')
+      expect(render({}, 'executing')).toBe('Working…')
       const params = { code: '1', activity: { id: 'check', completedTitle: 'Checked inputs' } }
       expect(render(params, 'executing')).toBe('Running checks')
       expect(render(params, 'success')).toBe('Ran checks')

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/tool-activity-group.tsx

@@ -144,7 +144,7 @@ export function ToolActivityGroup({
           activity={{
             label: working
               ? getActiveToolActivityTitle(
-                  `${generatingCall ? 'Preparing tool call…' : status.label}${running.length > 1 ? ` + ${running.length - 1}` : ''}`,
+                  `${generatingCall ? 'Working…' : status.label}${running.length > 1 ? ` + ${running.length - 1}` : ''}`,
                   statusTool,
                   tools
                 )