Declare File/View/Options/Help menus and their toggle items in XAML with x:Bind (TwoWay) to ViewModel properties. Radio/indexed submenus (Temperature Unit, Plot Location, Theme, Stroke Thickness, File Rotation, Update Interval, Logging Interval, Sensor Values Time Window) are declared as named empty MenuFlyoutSubItems and populated by PopulateRadioSubMenu in code-behind so dynamic check-state and Tag-based selection are preserved.
Click handlers for non-toggle items (save report, reset, expand/collapse, web server dialogs, about, exit) live on the code-behind. Delete BuildMenuBar, CreateToggleItem, CreateToggleSettingItem, BuildRadioSubMenu, BuildIndexedSubMenu. CreateMenuItem is retained for the still-imperative sensor row context menu.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
JMR-devandCopilot
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