Declare the sensor pane (SensorPane), header host (SensorHeaderHost), and TreeView (SensorTree, with its ContentPresenter DataTemplate and SelectionChanged handler) in XAML. The measurer-managed header grid and the per-row CreateSensorRow content remain imperative since they involve dynamic column-width pushing and per-item context flyouts/double-tap handlers; this is the hybrid fallback called out in the Phase 5b plan.
Drop _sensorTree/_sensorPane fields; replace BuildSensorPane with a small PopulateSensorHeader and delete the old XamlReader-loaded DataTemplate.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
JMR-devandCopilot
fd55a89e22