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The web build downloads the OCR models the first time Recognize Text (or Edit on a scanned page) needs them, installs the engine, and reads pages in up to two Web Workers (apps/pdfcraft-ocr-worker) built with WebAssembly SIMD, so the page keeps responding. The page prepares each page and sends its image to an idle worker, which runs ocrs and sends the lines back. Where no worker can start, the page reads with the installed engine. Answers go back to the run that sent the page (ocr_route), so a single run and a batch can overlap. Recognize Text in Multiple Files on the web keeps main's skipped-files bucket, low-confidence notes and cancel between files. Files chosen before the models are in wait for them. A scan Edit finds while no engine can read it waits for the models instead of counting as no scan. Trunk builds the worker beside the app; `cargo xtask web-worker-link` hashes its files and names it in index.html. The web zip ships the models in models/.