sandboxed top-level frame

This beta release addresses numerous bugs, including issues with protocol handling, window display, ASAR archives, crashes during process exit, and memory leaks. It also improves the behavior of custom V8 snapshots and the built-in PDF viewer.

This release includes several bug fixes, including issues with cross-origin fetches, WebContentsView rendering, ASAR archive handling, and sandbox restrictions for opened windows. It also standardizes `nodeIntegrationInWorker` inheritance for `<webview>` and `window.open`.