feat: add preload script with advanced logic

[alexanderniebuhr]

This PR is a bit larger than I like (@antfu sorry for that), but I try to explain

1. upgrade dependencies to latest stable versions
2. add preload script with context Isolation suggested way since v12 i suppose https://www.electronjs.org/docs/tutorial/context-isolation
3. refactor drag button with preload script and custom logic (should close win10 drag-dot no hover style #6) i think it does not feel that native, but it is fine. Could be improved with advanced throttle & debounce logic, I guess.
4. add new broz-bar with windi styles not happy with the looks but I am not a designer :P
5. add back / forward button and simple input field for URL (should close Basic navigation #8)
6. add toggle kiosk button (should close Fullsize screenshot #11)