Restore full height through the AppLockGate background wrapper, which otherwise lets the tray content collapse to about half of its window height. Preserve the existing lock-screen interaction restrictions.
Add real Electron regression coverage for repeated opening, session lists, lock/unlock, short windows, and Escape. Run it on macOS and Windows, including 100% and 200% device scale on Windows, and trigger it for the relevant renderer changes.
Fixes#3181
Netcatty-Bot