feat: add role-specific statistics to telemetry and UI (cont. #15234) (#18824)

Co-authored-by: Yuna Seol <yunaseol@google.com>

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

@@ -6,7 +6,7 @@
 
 import { useState, useCallback, useRef, useEffect, useMemo } from 'react';
 import type { Config } from '@google/gemini-cli-core';
-import { debugLogger, getResponseText } from '@google/gemini-cli-core';
+import { debugLogger, getResponseText, LlmRole } from '@google/gemini-cli-core';
 import type { Content } from '@google/genai';
 import type { TextBuffer } from '../components/shared/text-buffer.js';
 import { isSlashCommand } from '../utils/commandUtils.js';
@@ -110,6 +110,7 @@ export function usePromptCompletion({
         { model: 'prompt-completion' },
         contents,
         signal,
+        LlmRole.UTILITY_AUTOCOMPLETE,
       );
 
       if (signal.aborted) {