Handling beforeinstallprompt and Windows Start Menu

Hello, We run a web app designed for field contractors to calculate job estimates and present client proposals on surface devices and desktop setups. We are currently polishing the PWA installation experience for Microsoft Edge on Windows 11.

While the app meets standard Web App Manifest requirements, we have a couple of questions regarding Edge-specific PWA behavior:

Custom Install UI vs Address Bar Badge: When capturing the beforeinstallprompt event in Edge, what is the recommended pattern to trigger the native installation flyout without overriding the built-in address bar app icon?

Taskbar & Protocol Handler Integration: We want our app to launch directly when contractors click specific job links (https://coatly.ca...). What is the current best practice for registering custom URL protocol handlers in the web app manifest so Edge registers them smoothly with Windows File Explorer / OS shortcuts upon PWA installation?

Thanks for any insights or sample implementations!