MAK Invest HEIC converter

This converter runs on the visitor's device. No photo upload is performed.

Decoder: heic-to 1.6.7, libheif 1.23.7 (Struktur AG and contributors),
libde265 1.0.16 (Struktur AG and contributors). LGPL-3.0-or-later.
Licences: LICENSE-LGPL-3.txt and LICENSE-GPL-3.txt. The LGPL incorporates
the GNU GPL v3 terms.

The original CSP/no-eval libheif JavaScript is bundled unmodified with the
small MAK worker adapter (dimension/file limits, primary-image selection,
transferable pixel result, error handling). The adapter is LGPL-3.0-or-later.
The rest of the website is a separate application communicating by messages.

Corresponding sources, adapter, build script and instructions:
/vendor/heic/corresponding-source.zip

Project sources:
https://github.com/hoppergee/heic-to/tree/v1.6.7
https://github.com/strukturag/libheif/tree/v1.23.7
https://github.com/strukturag/libde265/tree/v1.0.16

To replace or modify the decoder, use the source archive and rebuild the
worker. Keep its URL and {width,height,pixels:ArrayBuffer} / {error} message
interface, or update the independent client adapter to the new interface.
No signature checks, access restrictions or secrets prevent replacement.

Build instructions:
1. Extract the included heic-to npm tarball to node_modules/heic-to.
2. Install esbuild 0.25.12 from npm (npm install --no-save esbuild@0.25.12).
3. Place the included scripts folder at the project root.
4. Run: node scripts/build-heic-decoder.mjs
5. Replace public/vendor/heic/decoder-1.6.7.js with the rebuilt file.

The heic-to tarball includes its original source, worker and compiled CSP
library. The preferred C/C++ source archives for libheif/libde265 are also
included. To regenerate the CSP library itself follow libheif's included
build-emscripten.sh and heic-to README, using LIBDE265_VERSION=1.0.16,
USE_UNSAFE_EVAL=0 and USE_WASM=0; then run the adapter build above.