修复环境变量，UI问题

app-expo/src/app/(main)/conversation/[id].tsx

@@ -3,6 +3,7 @@ import { useLocalSearchParams } from 'expo-router';
 import { Mic, Pause, Play, PlusCircle, Type, X } from 'lucide-react-native';
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import type {
+  LayoutChangeEvent,
   NativeSyntheticEvent,
   TextInputContentSizeChangeEventData,
 } from 'react-native';
@@ -669,6 +670,8 @@ export default function ConversationScreen() {
   const [isKeyboardVisible, setIsKeyboardVisible] = useState(false);
   const [keyboardHeight, setKeyboardHeight] = useState(0);
   const listRef = useRef<FlatList>(null);
+  /** 底部输入区（含连接提示 + 输入条）高度，用于多行输入增高时把列表滚到底，避免挡住最新消息 */
+  const composerBlockHeightRef = useRef<number | null>(null);
 
   useEffect(() => {
     const onShow = (e: { endCoordinates: { height: number } }) => {
@@ -707,6 +710,25 @@ export default function ConversationScreen() {
     }
   }, [startRecording, t]);
 
+  const scrollListToEndAfterComposerLayout = useCallback(() => {
+    InteractionManager.runAfterInteractions(() => {
+      requestAnimationFrame(() => {
+        listRef.current?.scrollToEnd({ animated: true });
+      });
+    });
+  }, []);
+
+  const onComposerBlockLayout = useCallback(
+    (e: LayoutChangeEvent) => {
+      const h = e.nativeEvent.layout.height;
+      const prev = composerBlockHeightRef.current;
+      if (prev !== null && Math.abs(h - prev) < 1) return;
+      composerBlockHeightRef.current = h;
+      scrollListToEndAfterComposerLayout();
+    },
+    [scrollListToEndAfterComposerLayout],
+  );
+
   const handleSend = () => {
     const text = input.trim();
     if (!text) return;
@@ -822,6 +844,7 @@ export default function ConversationScreen() {
             paddingBottom: composerZeroBottomInset ? 0 : insets.bottom,
           },
         ]}
+        onLayout={onComposerBlockLayout}
       >
         {showConnectionNotice ? (
           <View style={styles.connectionNotice}>