refactor: 重寫消息顯示相關邏輯

client/ui/chat/MessageContainer.tsx

@@ -0,0 +1,17 @@
+interface Args extends React.HTMLAttributes<HTMLElement> {}
+
+export default function MessageContainer({ children, style, ...props }: Args) {
+    return (
+        <div style={{
+            display: 'flex',
+            flexDirection: 'column',
+            justifyContent: 'flex-end',
+            alignItems: 'center',
+            marginBottom: '20px',
+            ...style,
+        }}
+        {...props}>
+            {children}
+        </div>
+    )
+}