Initiate the GeminiClient with a config

Also address the open readability improvement comments from #104.

packages/cli/src/ui/App.tsx

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import React, { useState, useMemo, useEffect } from 'react'; // Added useEffect
+import React, { useState, useMemo } from 'react';
 import { Box, Text } from 'ink';
 import { StreamingState, type HistoryItem } from './types.js';
 import { useGeminiStream } from './hooks/useGeminiStream.js';
@@ -25,10 +25,9 @@ import { Colors } from './colors.js';
 
 interface AppProps {
   config: Config;
-  initialInput?: string; // Added optional prop
 }
 
-export const App = ({ config, initialInput }: AppProps) => {
+export const App = ({ config }: AppProps) => {
   // Destructured prop
   const [history, setHistory] = useState<HistoryItem[]>([]);
   const [startupWarnings, setStartupWarnings] = useState<string[]>([]);
@@ -40,15 +39,6 @@ export const App = ({ config, initialInput }: AppProps) => {
   useStartupWarnings(setStartupWarnings);
   useInitializationErrorEffect(initError, history, setHistory);
 
-  // Effect to handle initial piped input
-  useEffect(() => {
-    if (initialInput && initialInput.trim() !== '') {
-      submitQuery(initialInput);
-    }
-    // Run only once on mount
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, []);
-
   const userMessages = useMemo(
     () =>
       history