Michael Freno b1bb9d9a1e refactor: rearchitect navigation model with pure store and no sidebar pane ...

- Extract navigation state and logic into navigation-store.ts for
  testability and separation of concerns
- NavigationContext now only wraps the store as a Solid provider
- Remove SIDEBAR_PANE from the model; depth-tabs have a single
  focusable content pane (center/current column)
- Split LayerGraph and page imports into layer-graph.ts so the
  navigation utils stay free of JSX (unit-testable)
- Update Shell keybind dispatch: remove sidebar pane handling,
  simplify swipe to fixed-pane tabs only, clarify depth-tab h/l
- Add nav-model.test.ts covering depth stack, tab/pane focus, and
  selection semantics

2026-07-31 10:24:45 -04:00

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