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Tight's JPEG sub-mode (previous commit) links libjpeg-turbo directly. Adds it to docs/BUILDING.md for all three platforms (apt libjpeg-turbo8-dev, brew jpeg-turbo, vcpkg libjpeg-turbo:x64-windows) and to the .deb package's Depends: line (libjpeg-turbo8). No changes needed for Windows (the Inno Setup script already wildcards *.dll) or macOS (macdeployqt bundles non-system dylibs automatically). Left the Flatpak manifests unchanged on the assumption that the KDE runtime already bundles libjpeg-turbo as a standard Qt JPEG-plugin dependency -- flagged in PROGRESS.md as worth confirming next time a Flatpak build actually runs, since that wasn't independently verified here. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>