DiffDialogTests.SetupBodyLockInterop registered bUnit SetupVoid planned
invocations that were never completed; DisposeAsync_WhileOpen awaited
DiffDialog.DisposeAsync -> TryUnlockBodyAsync -> InvokeVoidAsync on one of
them, suspending the test forever so the test host never exited (regression
from the CentralUI-023 catch-narrowing). SetupBodyLockInterop now uses Loose
JSInterop mode. Also dispose the leaked WebApplication instances in the Auth
tests (FileSystemWatcher + ConsoleLoggerProcessor threads) and the extra
ServiceProvider in the DebugView tests. Suite now runs 281 tests in ~7s and
exits cleanly.