Three buttons on MainPage's toolbar are reported as inoperative
in the running app: ACL, Mes cercles, and [DEV] Signature. They
click but no dialog / page opens.
This commit adds headless UI tests that drive each button via
the Avalonia headless harness (KeyPressQwerty(Enter) on a
focused, x:Name'd button, per the CalculatorTests pattern in
Avalonia.Samples) and asserts the post-click top of
NavRoot.NavigationStack is a non-null Page.
The tests fail today on every button (stack size before == after
== 1): the click does not push anything. The bug is the user's
real complaint — the test is now wired to catch it.
To make the buttons reachable by the harness without walking
the visual tree (which does not see buttons hosted inside a
NavigationPage), name the two unnamed buttons:
- ACL -> ManageAclButton
- Mes cercles -> OpenCirclesButton
([DEV] Signature was already named OpenSignatureDevButton.)
The XAML change is cosmetic; bindings and commands are
untouched. The test pattern follows SessionStatusBannerTests:
new MainWindow().Show(), PushAsync(MainPage), drive controls via
their generated x:Name fields.
