This is the reason why I never click the hyperlinks on LinkedIn (or anywhere else, including my email, also including hyperlinks allowing me to unsubscribe from services etc.) while in my main browser. Always sending them to incognito browser. If it requires me to be logged in then I just shrug my shoulders and not view it again. That's because I (as somebody who is not an expert in security) can't tell what those lo…
When opening a link it would only show a popup telling you what app tried to open what link and it gives you the option to choose what app/browser to open it or just to copy it. On mobile it would also have a share button.
It would be a completely offline app.
Just these features, nothing more.
Edit: actually it sounds like a good first Android app...