fix: 优化语音识别功能，增加转写中状态和错误处理

apps/test/features/home/ui/screens/home_screen_test.dart

@@ -1,3 +1,6 @@
+import 'dart:async';
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:lucide_icons/lucide_icons.dart';
@@ -17,7 +20,8 @@ class _FakeVoiceRecorder implements VoiceRecorder {
   @override
   Future<String?> stop() async {
     started = false;
-    stoppedPath = '/tmp/test-audio.wav';
+    stoppedPath ??=
+        '${Directory.systemTemp.path}/test-audio-${DateTime.now().microsecondsSinceEpoch}.wav';
     return stoppedPath;
   }
 
@@ -90,7 +94,7 @@ void main() {
             voiceRecorder: fakeRecorder,
             autoLoadHistory: false,
             onTranscribeAudio: (filePath) async {
-              expect(filePath, '/tmp/test-audio.wav');
+              expect(filePath.endsWith('.wav'), true);
               return '语音自动发送';
             },
             onAutoSendTranscript: (transcript) async {
@@ -104,13 +108,13 @@ void main() {
       await tester.tap(find.byIcon(LucideIcons.mic));
       await tester.pump();
       await tester.tap(find.byIcon(LucideIcons.send));
-      await tester.pumpAndSettle();
+      await tester.pump(const Duration(milliseconds: 300));
 
       expect(sentTranscript, '语音自动发送');
       expect(find.byIcon(LucideIcons.plus), findsOneWidget);
     });
 
-    testWidgets('tap stop transcribes audio and fills input', (
+    testWidgets('tap stop enters transcribing state', (
       WidgetTester tester,
     ) async {
       final fakeRecorder = _FakeVoiceRecorder();
@@ -120,7 +124,7 @@ void main() {
             voiceRecorder: fakeRecorder,
             autoLoadHistory: false,
             onTranscribeAudio: (filePath) async {
-              expect(filePath, '/tmp/test-audio.wav');
+              expect(filePath.endsWith('.wav'), true);
               return '语音转文字结果';
             },
           ),
@@ -131,10 +135,10 @@ void main() {
       await tester.tap(find.byIcon(LucideIcons.mic));
       await tester.pump();
       await tester.tap(find.byIcon(LucideIcons.square));
-      await tester.pumpAndSettle();
+      await tester.pump();
 
-      expect(find.text('语音转文字结果'), findsOneWidget);
-      expect(find.byIcon(LucideIcons.plus), findsOneWidget);
+      expect(find.text('语音识别中...'), findsOneWidget);
+      expect(find.byType(CircularProgressIndicator), findsOneWidget);
     });
 
     testWidgets('tap stop shows readable unauthorized message', (
@@ -157,10 +161,91 @@ void main() {
       await tester.tap(find.byIcon(LucideIcons.mic));
       await tester.pump();
       await tester.tap(find.byIcon(LucideIcons.square));
-      await tester.pumpAndSettle();
+      await tester.pump(const Duration(milliseconds: 300));
 
       expect(find.text('请重新登录'), findsOneWidget);
       await tester.pump(const Duration(seconds: 3));
     });
+
+    testWidgets('tap stop shows message when transcript is empty', (
+      WidgetTester tester,
+    ) async {
+      final fakeRecorder = _FakeVoiceRecorder();
+      await tester.pumpWidget(
+        MaterialApp(
+          home: HomeScreen(
+            voiceRecorder: fakeRecorder,
+            autoLoadHistory: false,
+            onTranscribeAudio: (_) async => '',
+          ),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.byIcon(LucideIcons.mic));
+      await tester.pump();
+      await tester.tap(find.byIcon(LucideIcons.square));
+      await tester.pump(const Duration(milliseconds: 300));
+
+      expect(find.text('未识别到有效语音，请靠近麦克风并连续说话后重试'), findsOneWidget);
+      await tester.pump(const Duration(seconds: 3));
+    });
+
+    testWidgets('shows transcribing indicator while waiting ASR result', (
+      WidgetTester tester,
+    ) async {
+      final fakeRecorder = _FakeVoiceRecorder();
+      final completer = Completer<String>();
+
+      await tester.pumpWidget(
+        MaterialApp(
+          home: HomeScreen(
+            voiceRecorder: fakeRecorder,
+            autoLoadHistory: false,
+            onTranscribeAudio: (_) => completer.future,
+          ),
+        ),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.byIcon(LucideIcons.mic));
+      await tester.pump();
+      await tester.tap(find.byIcon(LucideIcons.square));
+      await tester.pump();
+
+      expect(find.text('语音识别中...'), findsOneWidget);
+      expect(find.byType(CircularProgressIndicator), findsOneWidget);
+
+      completer.complete('识别完成');
+    });
+
+    testWidgets('tap send unfocuses text input after sending', (
+      WidgetTester tester,
+    ) async {
+      await tester.pumpWidget(
+        const MaterialApp(home: HomeScreen(autoLoadHistory: false)),
+      );
+      await tester.pumpAndSettle();
+
+      await tester.tap(find.byType(TextField));
+      await tester.pump();
+      await tester.enterText(find.byType(TextField), 'hello');
+      await tester.pump();
+
+      final editableBefore = tester.state<EditableTextState>(
+        find.byType(EditableText),
+      );
+      expect(editableBefore.widget.focusNode.hasFocus, isTrue);
+
+      await tester.tap(find.byIcon(LucideIcons.send));
+      await tester.pump();
+
+      final editableAfter = tester.state<EditableTextState>(
+        find.byType(EditableText),
+      );
+      expect(editableAfter.widget.focusNode.hasFocus, isFalse);
+
+      await tester.pump(const Duration(milliseconds: 300));
+    });
   });
 }