Adaptive layout

Every screen lays out for the window the app has now, on iOS and Android: one window classifier, breakpoints in one module, a readable column on wide windows, a list beside its detail when both fit in the box the panes get, grids sized from their own box, no orientation lock or resizing opt-out the platforms ignore anyway, and a selection that lives in the route so rotation, resizing and links keep it. A zero-dependency checker proves what a reviewer would otherwise check by eye.

Rules that must hold