Updated the sideloading status label and download button to provide clearer feedback when no device is connected or sideloading is disabled. The download button now shows "DOWNLOAD AND INSTALL" only when sideloading is enabled and a device is connected, otherwise it shows "DOWNLOAD". Meanwhile the sideloading status label now shows "Sideloading: No Device Connected" in orange while no device is connected. Also added missing </Setting> tag in Settings.settings
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