fix bug Handle folder name format based on OS

[jianba]

No description provided.

[jianba]

@abdularis bro look look

[Copilot]

Pull request overview

This PR fixes a bug in the file transfer sender by normalizing folder path separators based on the receiver's operating system. The change ensures that folder paths use backslashes for Windows receivers and forward slashes for Linux/macOS receivers.

• Adds OS-specific folder path separator normalization before sending file headers

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[Copilot]

The logic assumes only three operating systems (Windows, Linux, macOS). Consider using a more robust approach that explicitly handles all expected OS values or adds a default case. Additionally, using Qt's QDir::toNativeSeparators() and QDir::fromNativeSeparators() would be more maintainable than manual string replacement.

Suggested change

	if (mReceiverDev.getOSName() == "Windows") {
	mFolderName.replace("/", "\\");
	} else {
	// Linux & macOS
	mFolderName.replace("\\", "/");
	// Normalize folder name to use forward slashes first.
	QString normalizedFolder = QDir::fromNativeSeparators(mFolderName);
	const QString osName = mReceiverDev.getOSName();
	if (osName.compare("Windows", Qt::CaseInsensitive) == 0) {
	// Receiver is Windows: use backslashes.
	mFolderName = normalizedFolder;
	mFolderName.replace("/", "\\");
	} else if (osName.compare("Linux", Qt::CaseInsensitive) == 0
	|| osName.compare("macOS", Qt::CaseInsensitive) == 0) {
	// Receiver is Linux or macOS: keep normalized forward slashes.
	mFolderName = normalizedFolder;
	} else {
	// Fallback for other/unknown OS names: use normalized forward slashes.
	mFolderName = normalizedFolder;