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First stage of the zipped project file discussed in #1440 (and #865): the zip itself, nothing reads or writes a project with it yet. miniz 3.1.2 (MIT, one .c and one .h, no zlib) is bundled unmodified in sources/container/miniz, as the LZMA SDK is for .edz files, so builds need nothing new. QetZip wraps it: plain ZIP with Deflate, entries stored where asked (pictures, the mimetype entry), written through QSaveFile so a failed save keeps the previous file, without timestamps so that the same project gives the same bytes. Reading refuses unsafe or repeated entry names, encrypted entries and archives over 2 GB once unpacked. Test: tst_qetzip (round trip, same bytes twice, names refused both ways, truncated and non-zip input). A written archive also passes unzip -t and Python's zipfile. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019Wga9B92BNurDEtxxtCDxf