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The Win8-Start home grid's arrangement now syncs from the backend's
home-tile-layout plugin: ONE shared document per device orientation
(wide = landscape/desktop, tall = portrait/mobile) — every landscape
device renders the same layout, every portrait device the same other
one. localStorage persistence is retired (no migration — devices start
from the shared document; the first arrangement creates it).
- adapter/tile-layout-http.ts: the injected HTTP edge (GET/PUT/DELETE
/home/tile-layout/:mode), the features/layout adapter's pattern
- tile-layout-store: server-backed, keyed by geometry mode — boot +
orientation-change probes (stale in-flight responses never land),
locally-applied edits + debounced full-document PUT with rollback to
the last server document, WS push filtered to the active orientation,
quiet ephemeral degrade when the backend is unreachable (no error UI),
sync gated while a probe is in flight
- WorkspacesHome locks the store's orientation to the resolved grid
geometry (the landscape/portrait split IS the device-type split)
- app store: the tile store lives beside the layout store; the WS
dispatch feeds 'tile-layout' broadcasts into it; 'tiles' prop from
App.svelte (the page entry owns the httpBase)
- ws adapter: the 'tile-layout' server message (parse guard) + socket
handler; wire conformance case
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