优化

client/flutter/lib/widgets/loading_widget.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:sales_chat/theme/app_theme.dart';
+
+class LoadingWidget extends StatelessWidget {
+  final String? message;
+  final double size;
+
+  const LoadingWidget({
+    super.key,
+    this.message,
+    this.size = 40,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          SizedBox(
+            width: size,
+            height: size,
+            child: CircularProgressIndicator(
+              strokeWidth: 3,
+              valueColor: AlwaysStoppedAnimation<Color>(AppTheme.primaryColor),
+            ),
+          ),
+          if (message != null) ...[
+            const SizedBox(height: 16),
+            Text(
+              message!,
+              style: TextStyle(
+                color: AppTheme.textSecondary,
+                fontSize: 14,
+              ),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+}
+
+class LoadingOverlay extends StatelessWidget {
+  final bool isLoading;
+  final Widget child;
+  final String? message;
+
+  const LoadingOverlay({
+    super.key,
+    required this.isLoading,
+    required this.child,
+    this.message,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: [
+        child,
+        if (isLoading)
+          Container(
+            color: Colors.black.withOpacity(0.3),
+            child: Center(
+              child: Container(
+                padding: const EdgeInsets.all(24),
+                decoration: BoxDecoration(
+                  color: Colors.white,
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    const CircularProgressIndicator(),
+                    if (message != null) ...[
+                      const SizedBox(height: 16),
+                      Text(message!),
+                    ],
+                  ],
+                ),
+              ),
+            ),
+          ),
+      ],
+    );
+  }
+}