LazyTilesTileSchema

Renders a Column whose content is fetched from the network at display time: the tile calls url with method, headers and body, expects a JSON array of tile schemas back, and renders them in place of its placeholder.

States:

• tiles non-null → the loaded tiles are rendered and no request is made.

• tiles null and isFailureState false → placeholderTiles are rendered while the request runs (fired once via a single-shot effect, on the IO dispatcher).

• tiles null and isFailureState true → failureTiles are rendered and no request is made.

On success the renderer dispatches a local LazyTilesTileEvents.OnTilesLoadedSuccessfully and the holder builds real tile holders from the decoded schemas; on a transport error or a decoding error it dispatches OnTilesLoadFailure and the holder flips isFailureState. A local OnReloadTiles event clears the loaded tiles and the failure flag, putting the tile back into its loading state.

Triggers dispatched:

• OnDisplayEventTrigger — fired once when the tile enters composition (keyed by tile id).

• OnLoadTilesStartEventTrigger — right before the request is sent.

• OnLoadTilesSuccessEventTrigger — after the response has been received and decoded, so exactly one of this and the failure trigger fires per attempt.

• OnLoadTilesFailureEventTrigger — on a request or decoding failure; the Throwable is passed as the event's incoming data.

Notes: the request is issued directly by the renderer, not through the event pipeline, so it is not affected by event chaining. Children are laid out in a plain Column with no scope CompositionLocal and no scrolling.