Next refactors

lib/presentation/chat/widgets/new_chat_button.dart

@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+import 'package:trainhub_flutter/core/constants/ui_constants.dart';
+import 'package:trainhub_flutter/core/theme/app_colors.dart';
+
+class NewChatButton extends StatefulWidget {
+  const NewChatButton({super.key, required this.onPressed});
+
+  final VoidCallback onPressed;
+
+  @override
+  State<NewChatButton> createState() => _NewChatButtonState();
+}
+
+class _NewChatButtonState extends State<NewChatButton> {
+  bool _isHovered = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return MouseRegion(
+      onEnter: (_) => setState(() => _isHovered = true),
+      onExit: (_) => setState(() => _isHovered = false),
+      child: AnimatedContainer(
+        duration: const Duration(milliseconds: 150),
+        decoration: BoxDecoration(
+          color: _isHovered
+              ? AppColors.zinc700
+              : AppColors.surfaceContainerHigh,
+          borderRadius: BorderRadius.circular(UIConstants.smallBorderRadius),
+          border: Border.all(color: AppColors.border, width: 1),
+        ),
+        child: Material(
+          color: Colors.transparent,
+          child: InkWell(
+            borderRadius:
+                BorderRadius.circular(UIConstants.smallBorderRadius),
+            onTap: widget.onPressed,
+            child: const Padding(
+              padding: EdgeInsets.symmetric(
+                horizontal: UIConstants.spacing12,
+                vertical: UIConstants.spacing8,
+              ),
+              child: Row(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  Icon(
+                    Icons.add_rounded,
+                    size: 16,
+                    color: AppColors.textSecondary,
+                  ),
+                  SizedBox(width: UIConstants.spacing8),
+                  Text(
+                    'New Chat',
+                    style: TextStyle(
+                      color: AppColors.textSecondary,
+                      fontSize: 13,
+                      fontWeight: FontWeight.w500,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}