fix: handle system webview crash via onRenderProcessGone (#214)

Webview Kiosk is a free and open-source Android application for secure, kiosk-style web browsing. The app is designed for small businesses and device owners who are looking for a simpler alternative to Enterprise Mobility Management (EMM) or Mobile Device Management (MDM) systems. Key Features Lock Task Mode (Pin): prevent users from opening other apps or accessing the status bar. You can also enable the "Lock device when unpinning" android feature to further enhance security Protected Settings: protect app settings with biometrics or device credentials URL Filtering: supports regex-based blacklist and whitelist to control web access Export/Import: allow for backups of settings & configurations