perf: Optimize pressing enter to line breaks on mobile

[wangdan-fit2cloud]

What this PR does / why we need it?

Summary of your change

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• Made sure tests are passing and test coverage is added if needed.
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[shaohuzhang1]

The provided code contains no major irregularities or critical issues. However, there are a few minor enhancements that could be made to improve readability and functionality:

1. Function Name Clarity: The function name autoSendMessage suggests it's meant to handle auto-sending messages, but you might want to clarify its purpose with comments if it serves multiple roles.

2. Event Object Checking: Adding an additional check before attempting to access properties of event can ensure better type safety and prevent errors. For example:

   if (event && typeof event.preventDefault !== 'function') {
     return;
   }

3. Code Reformatting: Ensure consistent indentation and whitespace to make the code easier to read. This improves maintainability.

Here's the revised version of the function with these improvements:

function autoSendMessage() {
    // Functionality placeholder for automatic message sending logic here...
}

function sendChatHandle(event?: any): void {
    const isMobile = /Mobi|Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
    
    if ((isMobile || mode === 'mobile') && event?.key === 'Enter') {
        event?.preventDefault();
        return;
    }

    if (
        event &&
        typeof event.preventDefault === 'function' &&
        !event.ctrlKey &&
        !event.shiftKey &&
        !event.altKey &&
        !event.metaKey
    ) {
        event?.preventDefault();
    } else {
        console.warn("Invalid input detected; default action prevented.");
    }
}

These changes help make the code more robust and easier to understand. If the intention behind preventing certain actions remains unchanged, the current approach works well, so only the formatting and some optional checks have been added.