refactor(ui): 优化通话界面的布局和响应式设计

- 将通话覆盖层改为透明，仅保留底部控制栏的背景
- 使用响应式单位(w/h/sp)替换固定尺寸
- 调整按钮的阴影和边框使用响应式单位

lib/modules/agent/views/agent_view.dart

@@ -899,20 +899,28 @@ class _AgentViewState extends State<AgentView> with WidgetsBindingObserver {
   // 构建打电话模式覆盖层
   Widget _buildPhoneCallOverlay(BuildContext context, bool isDarkMode) {
     return Container(
-      color: isDarkMode ? Colors.black : Colors.white,
+      color: Colors.transparent, // 设置整个覆盖层为透明
       child: SafeArea(
         child: Column(
           children: [
-            // 顶部标题栏
-            _buildPhoneCallHeader(isDarkMode),
+            // 顶部标题栏 - 保持背景
+            // Container(
+            //   color: isDarkMode
+            //       ? Colors.black.withOpacity(0.8)
+            //       : Colors.white.withOpacity(0.8),
+            //   child: _buildPhoneCallHeader(isDarkMode),
+            // ),
 
-            // 中间音频可视化区域
-            Expanded(
-              child: _buildPhoneCallVisualization(isDarkMode),
+            // 中间音频可视化区域 - 完全透明
+            const Expanded(
+              child: SizedBox(), // 空的占位符，完全透明
             ),
 
-            // 底部控制按钮
-            _buildPhoneCallControls(isDarkMode),
+            // 底部控制按钮 - 保持背景
+            Container(
+              color: isDarkMode ? Colors.black : Colors.white,
+              child: _buildPhoneCallControls(isDarkMode),
+            ),
           ],
         ),
       ),
@@ -1042,7 +1050,7 @@ class _AgentViewState extends State<AgentView> with WidgetsBindingObserver {
   // 构建打电话模式控制按钮
   Widget _buildPhoneCallControls(bool isDarkMode) {
     return Container(
-      padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 24),
+      padding: EdgeInsets.symmetric(horizontal: 32.w, vertical: 24.h),
       child: Row(
         mainAxisAlignment: MainAxisAlignment.spaceEvenly,
         children: [
@@ -1068,8 +1076,8 @@ class _AgentViewState extends State<AgentView> with WidgetsBindingObserver {
               //   }
               // },
               child: Container(
-                width: 80,
-                height: 80,
+                width: 80.w,
+                height: 80.h,
                 decoration: BoxDecoration(
                   shape: BoxShape.circle,
                   color: isActive ? Colors.red : Colors.green,
@@ -1077,15 +1085,15 @@ class _AgentViewState extends State<AgentView> with WidgetsBindingObserver {
                     BoxShadow(
                       color: (isActive ? Colors.red : Colors.green)
                           .withOpacity(0.3),
-                      blurRadius: 12,
-                      spreadRadius: 2,
+                      blurRadius: 12.r,
+                      spreadRadius: 2.r,
                     ),
                   ],
                 ),
                 child: Icon(
                   isActive ? Icons.call_end : Icons.call,
                   color: Colors.white,
-                  size: 36,
+                  size: 36.sp,
                 ),
               ),
             );
@@ -1115,20 +1123,20 @@ class _AgentViewState extends State<AgentView> with WidgetsBindingObserver {
     return GestureDetector(
       onTap: onTap,
       child: Container(
-        width: 56,
-        height: 56,
+        width: 56.w,
+        height: 56.h,
         decoration: BoxDecoration(
           shape: BoxShape.circle,
           color: backgroundColor ??
               (isDarkMode ? Colors.grey[800] : Colors.grey[200]),
-          border: isActive ? Border.all(color: Colors.blue, width: 2) : null,
+          border: isActive ? Border.all(color: Colors.blue, width: 2.w) : null,
         ),
         child: Icon(
           icon,
           color: backgroundColor != null
               ? Colors.white
               : (isDarkMode ? Colors.white : Colors.black),
-          size: 24,
+          size: 24.sp,
         ),
       ),
     );

lib/modules/devices/views/devices_view.dart

@@ -1,6 +1,6 @@
 import 'dart:ui';
 
-import 'package:deep_voice/modules/devices/controllers/devices_controller.dart';
+import '/modules/devices/controllers/devices_controller.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:get/get.dart';