✨(preview) decode HEIC/HEIF images in the file preview#249
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Replace the "not supported" fallback for HEIC/HEIF with a real viewer. The decoder (heic-to, libheif compiled to WASM) is dynamically imported only when a HEIC/HEIF file is opened, so its ~2.9 MB payload stays out of the main bundle, and it decodes off the main thread in a Web Worker. The /csp build is used so it works under strict Content Security Policies (no unsafe-eval). On Safari, which decodes HEIC natively, the WASM download is skipped entirely. Decode failures fall back to the existing download screen.
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Replace the "not supported" fallback for HEIC/HEIF with a real viewer.
The decoder (heic-to, libheif compiled to WASM) is dynamically imported only when a HEIC/HEIF file is opened, so its ~2.9 MB payload stays out of the main bundle, and it decodes off the main thread in a Web Worker. The /csp build is used so it works under strict Content Security Policies (no unsafe-eval). On Safari, which decodes HEIC natively, the WASM download is skipped entirely. Decode failures fall back to the existing download screen.