Update Chat header styles for improved spacing and layout consistency

- Increased padding in the header_chat class from 32px to 40px for better spacing.
- Adjusted margin-bottom to 1px and set height to 79px for the header_chat, enhancing visual consistency.

These changes contribute to a more cohesive and visually appealing Chat interface, improving overall user experience.

packages/xgen/components/base/Page/index.less

@@ -10,7 +10,7 @@
 			}
 
 			.header_chat {
-				padding: 0 32px;
+				padding: 0 40px;
 			}
 		}
 	}
@@ -79,7 +79,8 @@
 		}
 
 		.header_chat {
-			margin-bottom: 0;
+			margin-bottom: 1px;
+			height: 79px;
 		}
 	}
 }