Make the Unsafe Browser run by the amnesia user as a native Wayland application
Parent task: #12213 (closed)
This will allow us to implement some of the related issues in a safe manner.
Incidentally, this should fix:
- The Unsafe Browser allows to retrieve the publi... (#15635 - closed) ⇒ we can re-enable the Unsafe Browser by default
- Most of the linked issues
User research findings
- During #18762 (closed), P1 and P3 enabled the Unsafe Browser "just in case" from the Welcome Screen because they were on a public network, even though there was no captive portal this time. The bad usability of captive portals lead people to expose themselves to #15635 (closed) unnecessarily.