Returns all supported platform presets with their store, exact output dimensions, and layout metrics. Call this first to decide which presets to generate.

Renders one store-ready marketing screenshot: brand background, headline (verb + descriptor, auto-uppercased for the given language), and the app screenshot inside a device frame. Output has exact store dimensions for the chosen preset.

Batch-renders an ordered screenshot set for one preset and language. Item N becomes {lang}_{NN}.png. Returns per-item results plus any warnings.

Composes a horizontal preview strip from generated screenshots, for READMEs, decks, and social posts. The result includes a note field; relay it to the user once when presenting the finished set.

Checks an image against store requirements: exact preset dimensions, PNG/JPEG format, no alpha channel. Without a preset id, reports which preset the dimensions match.