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Milestone 160 Pane Extraction

M160 extracts the editor's five content panes without changing the editor layout, authoring behavior, or backend pipeline. The fixed grid, splitters, bottom tabs, toolbar, menu, and status bar remain owned by MainWindow; this milestone does not introduce docking or layout persistence.

Extracted controls

  • RoutePaneControl owns the track header, connected authoring route, selected and highlighted node presentation, and route pointer/selection events.
  • ViewportPaneControl owns the viewport header, statistics, selection overlay, and the existing TrackViewportControl. It preserves the fit, projection, transported-frame visibility, station cursor, section highlight, and sample selection surface.
  • InspectorPaneControl owns the existing track, section, and canonical sample inspectors, including the established signed-radius edit path.
  • MathPlotsPaneControl owns the plot header, channel visibility toggles, station readout, and the existing EngineeringPlotWorkspaceControl.
  • DiagnosticsPaneControl owns the sampling and frame diagnostic summary and list.

Each pane is a public Avalonia UserControl with a parameterless constructor and explicit state/event properties for composition. The lower-level viewport and Math Plot renderers remain unchanged and are nested by their pane controls.

Coordination boundary

MainWindow remains the composition root. It listens to EditorWorkspace notifications, supplies the current immutable snapshots and selection state to the panes, relays pane interactions to the existing workspace commands, and synchronizes station and section highlighting across panes.

No new document, graph, geometry, sampling, or projection model was added. EditorWorkspace, TrackSamplingService, EngineeringSnapshot, the authoring graph compiler, undo/redo, and Track Layout Package V2 persistence remain the same sources of truth used before extraction. The Inspector's radius edit still uses EditorWorkspace.ApplyGraphEdit, so validation and atomic history behavior are unchanged.

Deliberate exclusions

  • docking, floating panes, tab rearrangement, or saved layouts;
  • new pane commands or editor features;
  • backend or file-format changes;
  • renderer replacement or engine dependencies.

The extraction contract is covered by Quantum.Tests/Editor/PaneExtractionContractTests.cs; the complete solution build and test suite continue to validate the existing backend and editor behavior.