Enhance RecordingButton with haptic feedback and debounce

Major UX improvements to RecordingButton:

1. Haptic Feedback (震动效果):
   - Add HapticFeedback.lightImpact() on button tap
   - Import flutter/services.dart for haptic support
   - Provides tactile confirmation for user interactions

2. Debounce Mechanism (防抖):
   - Add _isProcessing flag to prevent rapid consecutive taps
   - 300ms cooldown period after each tap
   - Protects against accidental double-taps and ensures stable operation

3. Enhanced Visual States:
   - Processing state with semi-transparent color
   - Loading spinner during async operations
   - Better visual feedback for different button states

4. Improved Animations:
   - Trigger scale animation on tap (not just on state change)
   - Smooth forward/reverse animation cycle
   - Better visual response to user interactions

5. Better Error Handling:
   - Proper mounted check before setState
   - Graceful cleanup with finally block
   - Prevents memory leaks and state corruption

These improvements provide:
- Better tactile feedback for users
- Prevention of UI race conditions
- Clearer visual indication of button states
- More responsive and professional user experience

lib/src/widgets/recording_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import '../interfaces/speech_recognition_service.dart';
 import '../yx_asr_service.dart';
 import '../models/speech_recognition_result.dart';
@@ -69,6 +70,7 @@ class _RecordingButtonState extends State<RecordingButton>
   late SpeechRecognitionService _speechService;
   bool _isListening = false;
   bool _isInitialized = false;
+  bool _isProcessing = false; // 防抖标志
   late AnimationController _animationController;
   late Animation<double> _scaleAnimation;
 
@@ -146,9 +148,23 @@ class _RecordingButtonState extends State<RecordingButton>
   }
 
   Future<void> _toggleRecording() async {
-    if (!_isInitialized || !widget.enabled) return;
+    // 防抖检查：如果正在处理中或未初始化或被禁用，则直接返回
+    if (_isProcessing || !_isInitialized || !widget.enabled) return;
+
+    // 设置处理中标志，防止重复点击
+    setState(() {
+      _isProcessing = true;
+    });
 
     try {
+      // 触觉反馈
+      await HapticFeedback.lightImpact();
+      
+      // 播放点击动画
+      _animationController.forward().then((_) {
+        _animationController.reverse();
+      });
+
       if (_isListening) {
         await _speechService.stopListening();
       } else {
@@ -160,6 +176,15 @@ class _RecordingButtonState extends State<RecordingButton>
         errorMsg: '切换录音状态失败: $e',
         errorCode: null,
       ));
+    } finally {
+      // 延迟重置处理标志，确保有足够的防抖时间
+      Future.delayed(const Duration(milliseconds: 300), () {
+        if (mounted) {
+          setState(() {
+            _isProcessing = false;
+          });
+        }
+      });
     }
   }
 
@@ -170,6 +195,8 @@ class _RecordingButtonState extends State<RecordingButton>
     Color buttonColor;
     if (!widget.enabled || !_isInitialized) {
       buttonColor = widget.disabledColor ?? Colors.grey;
+    } else if (_isProcessing) {
+      buttonColor = (widget.idleColor ?? theme.primaryColor).withValues(alpha: 0.7);
     } else if (_isListening) {
       buttonColor = widget.recordingColor ?? Colors.red;
     } else {
@@ -200,11 +227,20 @@ class _RecordingButtonState extends State<RecordingButton>
               child: InkWell(
                 borderRadius: BorderRadius.circular(widget.size / 2),
                 onTap: _toggleRecording,
-                child: Icon(
+                child: _isProcessing
-                  _isListening ? Icons.stop : Icons.mic,
+                    ? SizedBox(
-                  size: widget.size * 0.4,
+                        width: widget.size * 0.4,
-                  color: Colors.white,
+                        height: widget.size * 0.4,
-                ),
+                        child: CircularProgressIndicator(
+                          strokeWidth: 2,
+                          valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
+                        ),
+                      )
+                    : Icon(
+                        _isListening ? Icons.stop : Icons.mic,
+                        size: widget.size * 0.4,
+                        color: Colors.white,
+                      ),
               ),
             ),
           ),